Source: doc.rust-lang.org (std library reference) · crates.io database dump, 2026-07-25 (crates directory)Contact
UPDATE YEAR

Crates last updated in 2021

The 872 crates in this directory whose own rendered Last-updated date falls in 2021.

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.

872 crates last updated in 2021
adler2021 aes-ctr2021 aes-soft2021 aesni2021 affinity2021 afpacket2021 agnostik2021 aliasable2021 aliasable_deref_trait2021 aligned-array2021 aliri_clock2021 aliri_traits2021 android-properties2021 anomaly2021 anymap22021 app_dirs2021 ar2021 arc-interner2021 archiver-rs2021 ark-nonnative-field2021 arrayfire2021 as-slice2021 ashmem2021 aspect2021 assert_matches2021 assert_no_alloc2021 async-attributes2021 async-oncecell2021 async-oneshot2021 async-session2021 async-sse2021 async_fn_traits2021 async_ftp2021 async_io_stream2021 async_once2021 atelier_assembler2021 atelier_core2021 atelier_json2021 atelier_smithy2021 atelier_test2021 atomic-shim2021 atomicbox2021 atomicring2021 audiopus2021 audiopus_sys2021 audrey2021 auto_enums_core2021 auto_enums_derive2021 auto_ops2021 automap2021 avro-rs2021 backoff2021 bae2021 barrel2021 base582021 base912021 bb8-diesel2021 bcc-sys2021 bdk-macros2021 benfred-read-process-memory2021 bevy_wgpu2021 binary-merge2021 binfarce2021 binread2021 binread_derive2021 bitstruct2021 bitstruct_derive2021 blake2021 blake-hash2021 block-cipher-trait2021 block_on_proc2021 bloom-filters2021 bmrng2021 boolean_expression2021 bracket2021 broker2021 bs622021 build-env2021 build-parallel2021 build_const2021 builder-pattern2021 byteordered2021 bytesstr2021 bytestream2021 bzip2-rs2021 c2-chacha2021 c_str_macro2021 cache_control2021 cargo-deadlinks2021 cargo-emit2021 cargo-out-dir2021 cast2021 cauchy2021 cdr2021 cdrs2021 cexpr2021 cgmath2021 change-detection2021 checksums2021 chess2021 chiapos-chacha82021 choice2021 chrony-candm-derive2021 civet2021 cjson2021 claim2021 close_fds2021 cni-plugin2021 colored-diff2021 com2021 com_macros2021 com_macros_support2021 comma2021 commitlog2021 compile-time-run2021 concat-arrays2021 concolor-control2021 concurrent_lru2021 conduit2021 conduit-mime-types2021 configure_me2021 conqueue2021 console_error_panic_hook2021 const-default2021 const-default-derive2021 controlled-option2021 controlled-option-macros2021 core_detect2021 cosmwasm-bignumber2021 cpuid-bool2021 cron_clock2021 crusty-core2021 crypto-hashes2021 crypto-mac2021 crypto_api_chachapoly2021 csfml-audio-sys2021 csfml-graphics-sys2021 csfml-system-sys2021 csfml-window-sys2021 cstr-argument2021 ct-logs2021 ctrlc-async2021 cty2021 cucumber_rust2021 cucumber_rust_codegen2021 curve25519-dalek-fiat2021 curve25519-dalek-ng2021 cust_raw2021 custom_error2021 cw02021 dasp_window2021 datadog-logs2021 datetime2021 dbus-tree2021 debug_tree2021 debugit2021 decimal2021 deepsize_derive2021 defer-lite2021 deflate2021 delay2021 dencode2021 der-oid-macro2021 derivative2021 derive-error2021 detour2021 devx-cmd2021 devx-pre-commit2021 diffus2021 dirs-sys-next2021 divrem2021 do-notation2021 docopt2021 dotenv-parser2021 downcast2021 drawille2021 drm-fourcc2021 drop_bomb2021 drop_guard2021 drop_struct_macro_derive2021 dup-crypto2021 dyer-macros2021 dyn_partial_eq_derive2021 dynfmt2021 easy-error2021 ed25519-dalek-fiat2021 electron-hardener2021 elf-utilities2021 embed-doc-image2021 embedded-crc-macros2021 embedded-time2021 emoji2021 enquote2021 enum-display-derive2021 enum-kinds2021 enum-repr-derive2021 enum_to_enum2021 enum_to_enum_derive2021 envy2021 errno-dragonfly2021 escaper2021 eth2_hashing2021 eth2_serde_utils2021 eth2_ssz_derive2021 eth2_ssz_types2021 ethabi-contract2021 ethabi-derive2021 euc2021 event-listener-primitives2021 exa2021 expanduser2021 external-memory2021 faker_rand2021 fast-float2021 fast-srgb82021 fetch_unroll2021 ff-cl-gen2021 fff2021 fff_derive2021 ffi-opaque2021 ffi-support2021 ffi_helpers2021 ffmpeg-sys2021 fil-ocl2021 fil-ocl-core2021 file-mode2021 find_cuda_helper2021 findshlibs2021 fixed_ring_buffer2021 flatk2021 flatk-derive2021 flex-error2021 float-ord2021 float-pretty-print2021 fltk-derive2021 fluid-let2021 fluvio-command2021 fluvio-helm2021 fluvio-test-derive2021 fluvio-wasm-timer2021 fluvio_ws_stream_wasm2021 font8x82021 format-bytes2021 format-bytes-macros2021 format_serde_error2021 forward_ref2021 forwarded-header-value2021 fp_rust2021 framebuffer2021 fruity__bbqsrc2021 fs-swap2021 fs_util2021 fslock2021 fst2021 fstrings2021 fstrings-proc-macro2021 ftdi2021 futures-micro2021 futures-retry2021 futures012021 gag2021 garcon2021 generic_error2021 genpdf2021 geometry-predicates2021 get-port2021 gfapi-sys2021 gfx-auxil2021 gfx-backend-dx112021 gfx-backend-dx122021 gfx-backend-empty2021 gfx-backend-gl2021 gfx-backend-metal2021 gfx-backend-vulkan2021 gfx-hal2021 gfx-renderdoc2021 gherkin_rust2021 gir-format-check2021 git_rev2021 gitlab_clippy2021 glibc_version2021 global_counter2021 glsl-layout-derive2021 go-parse-duration2021 gouth2021 groupy2021 grpc-compiler2021 gtk-macros2021 gtmpl2021 gtmpl_derive2021 gtmpl_value2021 gzlib2021 handle2021 harfbuzz_rs2021 harsh2021 hash32-derive2021 hasher2021 hdf52021 hdf5-derive2021 hdf5-src2021 hdf5-sys2021 hdf5-types2021 hex2021 hexf2021 hexf-parse2021 historian2021 hnsw2021 holochain_json_api2021 holochain_json_derive2021 http-types2021 hxdmp2021 hyper-proxy2021 hyperx2021 hyphenation2021 hyphenation_commons2021 hytra2021 iai2021 iced_web2021 id_tree2021 ifmt2021 ifmt-impl2021 img_hash2021 include-flate-codegen-exports2021 include_dir_impl2021 indent2021 indent_write2021 index-map2021 inplace-vec-builder2021 input_buffer2021 internet-checksum2021 intertrait2021 intertrait-macros2021 intervaltree2021 inventory-impl2021 io-close2021 io_tee2021 ip_network2021 ip_network_table2021 ipsec-parser2021 is_close2021 iter-set2021 itoap2021 jackiechan2021 jrsonnet-gc2021 jrsonnet-gc-derive2021 json-decode2021 json_dotpath2021 json_typegen_shared2021 jsonl2021 jsonpath_lib2021 jsonref2021 jsonrpc-client-transports2021 jsonrpc-core2021 jsonrpc-core-client2021 jsonrpc-derive2021 jsonrpc-http-server2021 jsonrpc-ipc-server2021 jsonrpc-pubsub2021 jsonrpc-server-utils2021 jsonrpc-stdio-server2021 jsonrpc-tcp-server2021 jsonrpc-ws-server2021 jsonrpc_client2021 jsonrpsee-utils2021 jsonxf2021 jumphash2021 keytar2021 keytar-sys2021 kvdb-web2021 lab2021 laminar2021 language-tags2021 lapacke2021 legion2021 legion_codegen2021 lenient_semver2021 lenient_semver_parser2021 lenient_semver_version_builder2021 lenient_version2021 lerp_derive2021 lev_distance2021 leveldb-sys2021 levenshtein2021 levenshtein_automata2021 lewton2021 libquickjs-sys2021 libsecp256k1-core2021 libsecp256k1-gen-ecmult2021 libsecp256k1-gen-genmult2021 libsodium-sys2021 libtor-derive2021 libudev2021 lifetimed-bytes2021 linkcheck2021 liveterm2021 log-ndc2021 log-reroute2021 loopdev2021 lru_time_cache2021 lsp-codec2021 lspower2021 lspower-macros2021 luhn32021 luks22021 lyon_svg2021 magic_string2021 maglev2021 mailslurp2021 main_error2021 mallocator2021 matrixcompare2021 maud_htmlescape2021 mdns2021 meio2021 meio-connect2021 meio-protocol2021 merlin2021 meshx-derive2021 metaplex-token-metadata2021 metaplex-token-vault2021 metrix2021 mini-redis2021 minify2021 minimal-lexical2021 mio-anonymous-pipes2021 miracl_core2021 mirai-annotations2021 mit-build-tools2021 mmapio2021 mocktopus_macros2021 modular-bitfield-msb2021 modular-bitfield-msb-impl2021 moka-cht2021 mousse2021 mp4ameta_proc2021 mpmc2021 mqttbytes2021 mqttrs2021 multipart2021 multiparty2021 mur32021 my-iot2021 nacl2021 naive-timer2021 nakadion2021 nats_test_server2021 nb-connect2021 ndarray_einsum_beta2021 ndk-macro2021 near-runtime-utils2021 neo-mime2021 neo-mime-parse2021 netaddr22021 netbios-parser2021 nipper2021 nlprule2021 nlprule-build2021 nng2021 no-std-net2021 nohash2021 nom-leb1282021 nom-regex2021 nonzero_ext2021 nonzero_lit2021 noop-waker2021 noted2021 noxious2021 nphysics2d2021 nphysics3d2021 ntp-parser2021 null-terminated2021 numeric_literals2021 oak2021 oauth-credentials2021 odbc-safe2021 odht2021 olm-rs2021 oneline-eyre2021 open-metrics-client2021 open-metrics-client-derive-text-encode2021 openat2021 openpty2021 openssl-errors2021 opentls2021 ordered-map2021 paired2021 pallet-finality-tracker2021 pancurses2021 panic-message2021 parity-crypto2021 parity-multiaddr2021 parity-tokio-ipc2021 parity-ws2021 parquet-format2021 parse_duration2021 partial_ref2021 partial_ref_derive2021 partition2021 path-matchers2021 path_abs2021 pcg-mwc2021 pcg_rand2021 pdqselect2021 peeking_take_while2021 pep4402021 percent-encoding-rfc39862021 perlin2d2021 peroxide-ad2021 pest_consume_macros2021 pharos2021 php_serde2021 pin-weak2021 piston-ai_behavior2021 piston-float2021 piston-graphics_api_version2021 piston_meta2021 pistoncore-input2021 polonius-engine2021 portpicker2021 posish2021 posixmq2021 postcard-cobs2021 postgis2021 pp-rs2021 pre2021 pre-proc-macro2021 pretty_dtoa2021 print-nanny-client2021 proc-macro-hack-impl2021 proc-macro-id2021 proc-macro-nested2021 proc-quote2021 proc-status2021 proconio-derive2021 procout2021 project-root2021 prometheus-static-metric2021 proptest-recurse2021 prost-serde2021 proteus2021 protoc-rust-grpc2021 proxy-protocol2021 psl-codegen2021 psl-lexer2021 pulsectl-rs2021 pwhash2021 pwned2021 py_literal2021 python27-sys2021 quad-alsa-sys2021 queen2021 quick-error2021 quick-js2021 r2d2-memcache2021 r2d2_redis2021 ra_ap_arena2021 ra_ap_assists2021 ra_ap_ssr2021 racer-cargo-metadata2021 raii-counter2021 rants2021 rdxl2021 read-progress-stream2021 read_input2021 readwrite2021 rectangle-pack2021 redo2021 reductive2021 ref_slice2021 ref_thread_local2021 regex_static2021 regex_static_impl2021 regex_static_macro2021 rental2021 reopen2021 residua-zigzag2021 reusable-box-future2021 rill-protocol2021 ripemd1602021 ripemd3202021 ritelinked2021 rls-data2021 rls-span2021 robotstxt2021 rose_tree2021 rosrust_codegen2021 round2021 route-recognizer2021 routerify2021 rpmalloc2021 rrs-lib2021 rsa-der2021 rsa-export2021 rsgenetic2021 rsix2021 rspec2021 rtic-core2021 rtic-monotonic2021 rtp-rs2021 rust-bigint2021 rust-fuzzy-search2021 rust-gmp-kzen2021 rustacuda2021 rustc-ap-rustc_arena2021 rustc-ap-rustc_ast2021 rustc-ap-rustc_ast_passes2021 rustc-ap-rustc_ast_pretty2021 rustc-ap-rustc_attr2021 rustc-ap-rustc_data_structures2021 rustc-ap-rustc_errors2021 rustc-ap-rustc_expand2021 rustc-ap-rustc_feature2021 rustc-ap-rustc_fs_util2021 rustc-ap-rustc_graphviz2021 rustc-ap-rustc_index2021 rustc-ap-rustc_lexer2021 rustc-ap-rustc_lint_defs2021 rustc-ap-rustc_macros2021 rustc-ap-rustc_parse2021 rustc-ap-rustc_serialize2021 rustc-ap-rustc_session2021 rustc-ap-rustc_span2021 rustc-ap-rustc_target2021 rustorm2021 rusty_v82021 rutie-serde2021 rweb2021 rweb-macros2021 rweb-openapi2021 sabre-sdk2021 safer-bytes2021 saffron2021 salsa20-core2021 samplerate2021 sapp-wasm2021 sass-sys2021 sc-light2021 sc-transaction-graph2021 scaling2021 scan_fmt2021 schemafy2021 schemafy_core2021 schemafy_lib2021 scoped-env2021 scram2021 sea-strum2021 sea-strum_macros2021 seahash2021 sec2021 sec1_decode2021 secular2021 sedregex2021 segments2021 serde-diff2021 serde-diff-derive2021 serde-transcode2021 serde_bare2021 serde_bytes_base642021 serde_cbor2021 serde_dynamodb2021 serde_merge2021 serde_url_params2021 serpapi-search-rust2021 sfml-build2021 shaku_derive2021 shardio2021 sharks2021 shiplift2021 shuffling-allocator2021 simple-eyre2021 simple-xml-builder2021 simple_proxy2021 simple_xml_serialize2021 single-instance2021 skip_error2021 skulpin2021 slack-blocks2021 slices2021 slip102021 slip10_ed255192021 slog-atomic2021 slog-journald2021 slog-syslog2021 slyce2021 small-ord-set2021 smbus-pec2021 smolset2021 smt2parser2021 sn_data_types2021 sn_fake_clock2021 sn_messaging2021 sn_routing2021 snailquote2021 snake_case2021 snekdown2021 sodiumoxide2021 solana-budget-program2021 solana-failure-program2021 solana-noop-program2021 solana-ownable2021 solana-ramp-tps2021 solana-stake-monitor2021 solana-stake-o-matic2021 solana-vest-program2021 solana-vote-signer2021 solvent2021 soup2021 sourcefile2021 sp-allocator2021 sp-chain-spec2021 sp-finality-tracker2021 sp-npos-elections-compact2021 sp-tasks2021 sp-utils2021 spirv_cross2021 spirv_headers2021 ssh-parser2021 stable-eyre2021 stable-pattern2021 stack-buf2021 statest2021 static_dir2021 stats-cli2021 status-line2021 std-embedded-time2021 stopwatch22021 streamcatcher2021 stripmargin2021 strong2021 strong-xml2021 strong-xml-derive2021 structopt-derive2021 subslice2021 substrate-bn2021 substring2021 subtle-ng2021 sudo2021 surf2021 svgfilters2021 sys-info2021 ta2021 tagptr2021 tap2021 tbc2021 temptree2021 terminal-link2021 terminal-supports-emoji2021 terra-cosmwasm2021 test-assembler2021 test-env-log2021 tetsy-util-mem2021 thread-tree2021 tide2021 tide-rustls2021 tide-testing2021 tide-websockets2021 time-humanize2021 time-macros-impl2021 timing2021 tin-summer2021 tini2021 tiny-hderive2021 tinystr-raw2021 tinytemplate2021 to_method2021 tokio-byteorder2021 tokio-compat-022021 tokio-fd2021 tokio-pg-mapper2021 tokio-pg-mapper-derive2021 tokio-rayon2021 tokio-socketcan2021 tokio_env2021 tokio_env_macro2021 tonic_include_protos2021 topo_sort2021 tor-hash-passwd2021 torut2021 tower-test2021 toxiproxy_rust2021 tracing-distributed2021 tracing-flame2021 tracing-futures2021 tracing-wasm2021 trawler2021 tree-sitter-traversal2021 trees2021 triehash2021 trilean2021 triple_accel2021 try-partialord2021 tuple_list2021 tuple_utils2021 twilio-async2021 twoway2021 type_hash2021 type_hash_core2021 type_hash_macros2021 tzfile2021 uint-crate2021 uname-rs2021 unicode_reader2021 unified-diff2021 unix_path2021 unsafe-io2021 unsize2021 untrusted2021 unwind_safe2021 ursa2021 utf-82021 utf16_lit2021 uwuify2021 v_escape_derive2021 vcell2021 vcpkg2021 vcr-cassette2021 vcsgraph2021 vec-arena2021 vec-collections2021 vector3d2021 vectorize2021 visible2021 vk-sys2021 volatile-mem2021 vorbis-sys2021 vpp-api-message2021 wasm-bindgen-webidl2021 wasm-rs-async-executor2021 wasm-rs-dbg2021 wasmer-engine-jit2021 wasmer-engine-native2021 wasmer-runtime-near2021 wasmer_enumset2021 wasmer_enumset_derive2021 wasmtime-debug2021 wasmtime-obj2021 wasmtime-profiling2021 wchar-impl2021 web-view2021 web3-async-native-tls2021 webview-sys2021 webview22021 webview2-sys2021 weighted-rs2021 wepoll-ffi2021 windows-acl2021 windows-permissions2021 winres2021 winrt2021 wit-walrus2021 witx2021 woothee2021 workspace-hack2021 wraptest2021 wslpath2021 wtf82021 wtns-file2021 www-authenticate2021 x25519-dalek-fiat2021 x25519-dalek-ng2021 x5092021 xcb-util2021 xmldecl2021 xmlrpc2021 xorfilter-rs2021 yaml-front-matter2021 yaml-rust2021 yastl2021 yew-router-route-parser2021 yewtil2021 z3tracer2021 zoneinfo_compiled2021