CATEGORY

No standard library::No dynamic allocation 1,340 crates

Data as of 2026-07-25 (crates.io database dump, timestamp 2026-07-25T02:00:36Z). Source: crates.io · db-dump.tar.gz · methodology & corrections.

use-chordChord metadata primitives for RustUse.85MIT OR Apache-2.0 Data structures No standard library::No dynamic allocation use-dynamicsDynamic marking metadata primitives for RustUse.85MIT OR Apache-2.0 Data structures No standard library::No dynamic allocation use-tuningTuning metadata primitives for RustUse.85MIT OR Apache-2.0 Data structures No standard library::No dynamic allocation riscv-stackStack usage tools for RISCV processors84MIT OR Apache-2.0 Embedded development Hardware support embedded-hal-timerTrait definition for embedded-hal Timer & Alarm76MIT OR Apache-2.0 Embedded development Hardware support leimu-memCustom allocator collections and utilities.75MIT or Apache-2.0 Data structures Memory management matrix-rainClassic Matrix digital rain effect as a ratatui widget (no_std-capable) and standalone TUI binary.74MIT Command line utilities Embedded development edge-nal-tlsAn implementation of edge-nal's TCP factory and socket traits over TLS, using `mbedtls-rs`74MIT OR Apache-2.0 Asynchronous Embedded development bmp5xxTrue-to-spec async I2C driver for the BMP580/BMP581/BMP585 barometric pressure sensors.70GPL-3.0-or-later Embedded development Hardware support psoc-pac-psc3Peripheral Access Crate for Infineon PSOC™ Control C3 microcontrollers70non-standard Embedded development Hardware support psoc-pac-psoc6_02Peripheral Access Crate for Infineon CY8C6xx8 and CY8C6xxA PSOC™ 6 microcontrollers68non-standard Embedded development Hardware support psoc-pac-psoc6_03Peripheral Access Crate for Infineon CY8C6xx5 PSOC™ 6 microcontrollers68non-standard Embedded development Hardware support micro-xoodyakA lightweight, zero-allocation implementation of the Xoodyak cryptographic scheme, optimized for 32-bit microcontrollers (ARM…68MIT Cryptography Embedded development std2"minimal std is a feature" - a coping rust shill.67GPL-3.0-only No standard library No standard library::No dynamic allocation psoc-pac-psoc6_01Peripheral Access Crate for Infineon CY8C6xx6 and CY8C6xx7 PSOC™ 6 microcontrollers67non-standard Embedded development Hardware support psoc-pac-psoc6_04Peripheral Access Crate for Infineon CY8C6xx4 PSOC™ 6 microcontrollers66non-standard Embedded development Hardware support purcargsimple command line parser64Apache-2.0 Command-line interface No standard library planck-packMixed-radix bit-packing serialization for Rust63MIT OR Apache-2.0 Embedded development Encoding use-musicComposable symbolic music primitive facade for RustUse.63MIT OR Apache-2.0 Data structures No standard library::No dynamic allocation limen-codegenReusable code generator for Limen graphs (proc-macro and build.rs compatible).62Apache-2.0 Embedded development No standard library::No dynamic allocation nvme-mi-devA device-side implementation of NVMe-MI62GPL-3.0-only Embedded development No standard library::No dynamic allocation simple-dstTraits for allocating and using custom DSTs.62MIT OR Apache-2.0 Data structures Memory management embedded-shadowZero-alloc shadow register table with dirty tracking for embedded systems61MIT OR Apache-2.0 Data structures Embedded development ssd1677-driverA `no_std` driver for an SSD1677 based display compatible with Embedded Graphics.61MIT Embedded development Graphics registersA simple library for working with registers in Rust.61MIT Embedded development Hardware support unicode-id-trie-rleUnicode identifier (UAX #31) checker using a deduplicated trie with run-length encoded leaves.60Unicode-3.0 AND (0BSD OR CC0-1.0 OR Unlicense)No standard library No standard library::No dynamic allocation iso9660_coreRead-only ISO9660 crate for no_std environments (WIP)58MIT Embedded development Filesystem tiny-itoano_std integer primitive to decimal string conversion57MIT No standard library No standard library::No dynamic allocation codletCore authentication primitives for codlet: code policy, generation, normalization, keyed lookup derivation, lifecycle state…56Apache-2.0 Authentication Cryptography ustyleA text-styling library for Rust `no_std` embedded targets.55MIT Command-line interface Embedded development opusculeA pure-Rust, memory-safe, no_std-capable Opus audio decoder.55MPL-2.0 Multimedia::Audio No standard library::No dynamic allocation subms-statsLatency-distribution statistics. Pure functions on &[u64] sample arrays: percentiles, log2-spaced CDF histograms, jitter score,…54MIT OR Apache-2.0 Development tools::Profiling Mathematics decimaxFast, fixed-size, floating-point decimal types.54MIT Data structures Finance jandi-colorsColor palette derived from the blue pigment of jenipapo (Genipa americana)53MIT GUI No standard library::No dynamic allocation orgorgno_std compatible Cave Story Organya Music Player53MIT Multimedia::Audio No standard library lean-decimalFast, fixed-precision, floating-point decimal types.53MIT Data structures Finance refiningRefinement types.52MIT No standard library No standard library::No dynamic allocation nox-memCustom allocator collections and utilities50MIT or Apache-2.0 Data structures Memory management colorthief-datasetStatic xkcd color-hierarchy table with pre-computed LAB used by `colorthief` for human-vocabulary color naming.49MIT OR Apache-2.0 Algorithms Data structures qemu-debugconSimple QEMU debugcon wrapper49MIT OR Apache-2.0 Embedded development No standard library colconvSIMD-dispatched color conversion for the FFmpeg AVPixelFormat space: one-call decode of validated source frames to RGB / RGBA /…49GPL-3.0-or-later Multimedia Multimedia::Images numaxiomLightweight numeric marker traits for ranges/signs plus constants and ops; std by default, no_std optional.48MIT OR Apache-2.0 Mathematics No standard library::No dynamic allocation lwbcCompact implementations of small block ciphers (SPECK, SIMON, SIMECK)48MIT Cryptography No standard library::No dynamic allocation tmag5273Platform-agnostic no_std driver for the TI TMAG5273 3-axis Hall-effect sensor47MIT OR Apache-2.0 Embedded development Hardware support metal-softfloatIEEE-754 binary64 (f64) software emulation for Apple Metal compute kernels and pure Rust47MIT AND BSD-3-Clause Graphics Mathematics regit-identifiersSecurities identifier validation in pure Rust — ISIN, CUSIP, SEDOL, LEI, BIC, MIC, FIGI, CFI and national numbers. Check-digit…46Apache-2.0 Finance No standard library::No dynamic allocation microstrain-inertialLibrary for communicating with Microstrain inertial measurement units via MIP protocol46MIT Embedded development No standard library arm-mhuArm Message Handling Unit (MHU) driver46MIT OR Apache-2.0 Embedded development Hardware support nanondefA no-std, no-alloc, minimal NDEF encoding and decoding library.46non-standard Embedded development Encoding mod2kFast arithmetic modulo `2^k`, `2^k - 1`, and `2^k - d`.45MIT Algorithms Mathematics krypteia-silentopsSide-channel countermeasure toolkit: constant-time primitives, dudect-style timing leakage verifier, and shared SCA helpers for…45Apache-2.0 Cryptography Embedded development wireguard-sans-ioA sans-I/O, no_std, zero-allocation, zero-dependency, panic-free WireGuard protocol implementation45MIT OR Apache-2.0 Cryptography Network programming pure_mbrA library to parse the master boot record (MBR)44AGPL-3.0-or-later Embedded development Filesystem emailaddrType-safe, zero-copy, validated email addresses with generic storage, IDNA domain support, and no_std/no-alloc compatibility.44MIT OR Apache-2.0 Email Internationalization (i18n) container_traitsTraits for container types43MIT Data structures No standard library::No dynamic allocation bbqioembedded_io_async wrappers for bbqueue42MIT Embedded development No standard library pm2_typesTypes for pm2.41GPL-3.0-only No standard library No standard library::No dynamic allocation oplonA no_std, integer-only OPL2/OPL3 (Yamaha YM3812/YMF262) FM synthesis core with a clean-room, compile-time-generated ROM set38MIT Emulators Multimedia::Audio wrapscreate marker types that wrap other, inner, types - with trait impls matching PhantomData38MPL-2.0 No standard library::No dynamic allocation Rust patterns embedded-build-toolsReusable building blocks for bare-metal Rust kernel build pipelines: bootable disk-image assembly (FAT32/ESP/MBR), QEMU…38MIT OR Apache-2.0 Development tools::Build Utils Embedded development trtzGPS to timezone for embedded38MPL-2.0 Embedded development No standard library locatA zero-copy ISO 6709 geographic coordinate parser in Rust.38MIT OR Apache-2.0 Encoding No standard library::No dynamic allocation refutilVarious utilities for reference, lifetime and memory management38MIT No standard library No standard library::No dynamic allocation simx00xA no-std and no-alloc driver for SIM800L GSM modules (and probably similar modules)38MIT OR Apache-2.0 Embedded development No standard library::No dynamic allocation regit-daycountDay-count fractions and business-day calendars in pure Rust — Act/360, Act/365F, ActAct ISDA, ActAct ICMA, 30/360, 30E/360,…36Apache-2.0 Finance Mathematics whpxIdiomatic Rust Bindings of Windows Hypervisor Platform35MIT No standard library No standard library::No dynamic allocation enum-map-liteA stripped-down enum-keyed map backed by a fixed array. Like enum-map but without from_usize (no key/pair iteration), so…35MIT OR Apache-2.0 Data structures No standard library::No dynamic allocation ads8681A rust library for the ads868134non-standard Embedded development No standard library::No dynamic allocation cyclotraceA high-performance, wait-free ring buffer in Rust. Supports SPMC with peek-based semantics instead of destructive consumption.34MIT OR Apache-2.0 Concurrency Data structures coprimeZero-dependency, no_std u64 number theory and modular arithmetic. Public, secret-free — Stage One, no constant-time guarantees…32BSD-3-Clause Cryptography Mathematics cst816s-asyncCST816S touch controller driver for embedded hal async / no_std31MIT OR Apache-2.0 Asynchronous Embedded development cutUtilities.31GPL-3.0-only No standard library No standard library::No dynamic allocation fast-unescape'unescapes' a escaped string with escape sequences into literal one30LGPL-3.0-or-later No standard library No standard library::No dynamic allocation forced-channelSets a forced rustc channel in the called crates.30MIT OR Apache-2.0 No standard library No standard library::No dynamic allocation numa-shim100% Rust NUMA detection and binding — no C/C++ libraries (no libnuma, no hwloc). Linux mbind(2) via raw syscall(2), Windows…30MIT OR Apache-2.0 Memory management No standard library::No dynamic allocation pcobsBinary encoding for structured data communication29MIT Embedded development Encoding catalinaEmbedded Rust ecosystem for audio processing and music28MIT Command line utilities Embedded development ts-103-636-utilsProtocol decoding and encoding utilities for ETSI TS 103-636 'DECT-2020 New Radio (NR)'28MIT OR Apache-2.0 No standard library::No dynamic allocation fasrtA blazing fast, zero-copy subtitle parser and writer for SRT and WebVTT in Rust.27MIT OR Apache-2.0 Encoding Multimedia pure_fatA super flexible library for parsing FAT file systems27AGPL-3.0-or-later Embedded development Filesystem lp50xx-asyncAsync Rust driver for the lp50xx family of Texas Instruments I2C RGB LED drivers27MIT OR Apache-2.0 Embedded development Hardware support enveloMinimal envelope that bundles header, payload, and per-route metadata; no dependencies and `#![no_std]`.27MIT OR Apache-2.0 Data structures No standard library::No dynamic allocation thai-number-textConvert numbers to Thai text with Baht currency, accounting style, and scientific notation support26MIT Internationalization (i18n)No standard library::No dynamic allocation xdigest-sysExtremely fast digest algorithm implementations packaged into a lightweight library.26Apache-2.0 Algorithms Cryptography thread-modeSwitching code from multi-threaded to single-threaded26MIT Development tools No standard library bektorA simple vector, quaternion, geometry, and matrix library26GPL-3.0-only Mathematics No standard library::No dynamic allocation small_is_primeprimality tests for the primitive integer types26MIT OR Apache-2.0 Mathematics No standard library::No dynamic allocation ferrodec-decimal64no_std IEEE 754-2019 Decimal64 for embedded use, with Kani-verified properties26MIT OR Apache-2.0 Embedded development Mathematics ptraitA small crate providing traits for pointer-like types, such as references and smart pointers.25MIT No standard library No standard library::No dynamic allocation dps310-asyncUniversal embedded async driver for Infineon DPS310.25GPL-3.0-or-later Embedded development Hardware support prudent-macros-enforceprudent-rs internal. Don't use directly/on its own. Instead, see and use prudent.25BSD-2-Clause OR Apache-2.0 OR MIT Development tools No standard library fnv1A Hasher implementation for the FNV-1 hash function24Unlicense Algorithms No standard library ssd1619aDriver for the SSD1619A e-Paper display controller, for use with embedded-graphics24MIT OR Apache-2.0 Embedded development Graphics smallishLightweight, no-std syntax for configuration and scripting.24MIT Configuration No standard library ferrodec-decimal32no_std IEEE 754-2019 Decimal32 for embedded use, with Kani-verified properties24MIT OR Apache-2.0 Embedded development Mathematics campoEasily create and handle bit fields.23MIT OR Apache-2.0 Data structures No standard library tf-firmware-handoffLibrary implementing the Firmware Handoff specification23MIT OR Apache-2.0 Data structures Embedded development endless-rsA Rust SDK for the Polyend Endless programmable effects pedal22MIT Embedded development Multimedia::Audio cborld-exCompact Binary Linked Data with Semantic Reasoning for Constrained IoT Networks22MIT Embedded development Encoding async-boundsAttribute to declare bounds on the Future returned by an async fn22Apache-2.0 OR MIT Asynchronous No standard library soxr-axSafe, comprehensive Rust bindings for libsoxr resampler22LGPL-2.1 API bindings Multimedia::Audio sliding-quantileMoving quantile over a sliding window of size N with O(1) queries, O(log N) updates, and O(N) memory.22MIT OR Apache-2.0 Algorithms Mathematics limen-buildProc-macro wrapper for limen-codegen.21Apache-2.0 Embedded development No standard library::No dynamic allocation ferrodec-ieeeShared IEEE 754-2019 metadata types (Status, RoundingMode, IeeeClass) for the ferrodec family21MIT OR Apache-2.0 Embedded development Mathematics sha2-fvFormally verified Pure Rust implementation of the SHA-2 hash function family (SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224,…21MIT OR Apache-2.0 Cryptography No standard library arm-scmiArm System Control and Management Interface driver21MIT OR Apache-2.0 Embedded development Hardware support hfdt-rsA quite high-level safe no-std zerocopy zero-dependencies Open Firmware FDT DeviceTree's parsing library.21MIT Embedded development Hardware support colorthiefDominant-color extraction (MMCQ) and human-vocabulary naming for packed-RGB video keyframes — CIEDE2000 (default, scalar), CIE94…20MIT OR Apache-2.0 Algorithms Multimedia::Images shrimps-signerPost-quantum SHRIMPS signature scheme: WOTS+ with Merkle trees for STARK-provable verification20MIT Cryptography No standard library::No dynamic allocation static-mapsetMaps and sets based on ordered array or slice20MIT OR Apache-2.0 Algorithms No standard library int-castConvenient casts between primitive integers.20MIT OR Apache-2.0 Algorithms Mathematics femtoflatbuffersTiny no_std, allocation-optional FlatBuffers encoder/decoder driven by derive macros instead of a schema compiler20MIT OR Apache-2.0 Embedded development Encoding licklider-coreSans-I/O protocol engine for the Licklider Transmission Protocol (LTP, RFC 5326)20MIT OR Apache-2.0 Network programming No standard library::No dynamic allocation limen-runtimeLimen runtime implementations and schedulers.19Apache-2.0 Embedded development No standard library::No dynamic allocation limen-platformPlatform adapters for Limen.19Apache-2.0 Embedded development No standard library::No dynamic allocation moco-machineThe tiny machine19Unlicense No standard library No standard library::No dynamic allocation hardboundHardbound — public trait surface for the enterprise hardware-bound trust tier of Web4. Implementations of these traits anchor…19AGPL-3.0-or-later Authentication Cryptography psoc-pac-pse8x4Peripheral Access Crate for Infineon PSOC™ Edge E8x4 microcontrollers19non-standard Embedded development Hardware support age-otpGenerate and verify time-based OTP codes from age public keys19MIT Authentication Cryptography limen-nodeLimen node implementations.18Apache-2.0 Embedded development No standard library::No dynamic allocation muiA simple drop guard for MaybeUninit18Apache-2.0 Memory management No standard library::No dynamic allocation sample-resourceTraits for working with arbitrary resources of audio samples18MIT OR Apache-2.0 Encoding Multimedia::Audio redbear-tui-themeDefault TUI skin palette for Red Bear OS — single source of truth for the Red Bear brand colours used by every TUI application18MIT Configuration No standard library baseratorBase16, Base32, Base45 and Base64 decoding and encoding via Iterator interfaces.17MIT OR Apache-2.0 Encoding No standard library mldsa-kitBatteries-included FIPS-204 ML-DSA-87 signing, encrypted keystore (Argon2id + AES-256-GCM) and address derivation. Pure Rust,…17MIT Cryptography No standard library::No dynamic allocation silentopsSide-channel countermeasure toolkit: constant-time primitives, dudect-style timing leakage verifier, and shared SCA helpers for…17Apache-2.0 Cryptography Embedded development safyControlled/scoped invocation of unsafe functions in Rust17BSD-2-Clause OR Apache-2.0 OR MIT Development tools No standard library byte-deriveTryRead and TryWrite derive macros for the bytes crate16MIT No standard library::No dynamic allocation buffoMemory-backed buffer toolkit with Chunk/ChunkMut traits for predictable, explicit, and retry-friendly access; ideal for Sans-I/O…15MIT OR Apache-2.0 Data structures Encoding tpt-zero-memSafe, no_std memory utilities including secure (non-elidable) zeroing14MIT OR Apache-2.0 Memory management No standard library base64_padFast, efficient, correct, and const base64 with padding encoding and decoding13MIT OR Apache-2.0 Encoding No standard library::No dynamic allocation implerMacros to generate an enum that implements a user-specified trait and wraps values of other types that implement the same trait,…13BSD-2-Clause OR Apache-2.0 OR MIT No standard library No standard library::No dynamic allocation localHelp you make Rust code safer. Macros to provide locally scoped safe alternatives to unsafe references or values.12BSD-2-Clause OR Apache-2.0 OR MIT Development tools No standard library privateHelp you make Rust code more accident-proof. Macros to enable other crates to export macros (either declarative/by example/using…12BSD-2-Clause OR Apache-2.0 OR MIT Development tools No standard library restrictedPrevent consumers of your Rust macros from accidents. Enable crates to export private-like types, traits and functions that are…12BSD-2-Clause OR Apache-2.0 OR MIT Development tools No standard library tpt-zero-bitsetFixed-size, highly optimized bit arrays for state tracking, #![no_std]12MIT OR Apache-2.0 Data structures No standard library tpt-zero-base85Z85 (ZeroMQ RFC 32) Base85 encoding/decoding into caller-supplied buffers, #![no_std], no alloc12MIT OR Apache-2.0 Encoding No standard library tpt-zero-cidrPure-core IPv4/IPv6 CIDR and subnet arithmetic (no std::net), #![no_std]12MIT OR Apache-2.0 Network programming No standard library tpt-zero-checkdigitLuhn, ISBN-10/13/EAN-13/UPC-A, and ISO/IEC 7064 MOD 11-2/MOD 37-2 check digits, #![no_std]10MIT OR Apache-2.0 Algorithms No standard library diapauseCoroutines/generators for stable Rust via code transformation — no async, no Pin, no allocation, no unsafe code7MIT No standard library No standard library::No dynamic allocation