Dev tools · alternatives · 2026
24 alternatives to Valid8r, Functional validation for Python CLIs using Maybe monads
I built Valid8r because I got tired of writing the same input validation code for every CLI tool. You know the pattern: parse a string, check if it's valid, print an error if not, ask again. Repeat for every argument. The library uses Maybe monads (Success/Failure instead of exceptions) so you can chain parsers and validators: # Try it: pip install valid8r from valid8r.core import parsers, validators # Parse and validate in one pipeline result = ( parsers.parse_int(user_input) .bind(validators.minimum(1)) .bind(validators.maximum(65535)) ) match result: case Success(port): print(f"Using…
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
Validator▲345Research and validate you micro saas ideas fast as Cheetah
2024 · validator.help · its alternatives →
- 2
A very fast library for validating UTF-8 using AVX2/SSE4 instructions - zwegner/faster-utf8-validator
2019 · github.com · its alternatives →
- 3RM
2021 · hexdocs.pm · its alternatives →
- 4V1
A simple, fast, extensible python library for data validation. New features: * union validator * dynamic dict validator * timedelta validator * enum validator * slug validator * fqdn validator * nested model class GitHub: https://github.com/guyskk/validr Document: https://github.com/guyskk/validr/wiki Usage: https://github.com/guyskk/validr/wiki/Scenario-&-Example
2020 · its alternatives →
- 5
Typesafe, Composable Validation. Contribute to keithasaurus/koda-validate development by creating an account on GitHub.
2022 · github.com · its alternatives →
- 6
Python to Regex. Regex to Python. The yRegex for humans. - iogf/crocs
2017 · github.com · its alternatives →
- 7
GitHub: https://www.github.com/fizzbee-io/FizzBee Traditionally, formal methods are used only for highly mission critical systems to validate the software will work as expected before it's built. Recently, every major cloud vendor like AWS, Azure, Mongo DB, confluent, elastic and so on use formal methods to validate their design like the replication algorithm or various protocols doesn't have a design bug. I used TLA+ for billing and usage based metering applications. However, the current formal methods solutions like TLA+, Alloy or P and so on are incredibly complex to…
2024 · fizzbee.io · its alternatives →
- 8
SIMD-accelerated UTF-8 validation for Rust. Contribute to rusticstuff/simdutf8 development by creating an account on GitHub.
2021 · github.com · its alternatives →
- 9
A CLI tool to build beautiful rich text command-line interfaces with type validation. - Andarius/piou
2021 · github.com · its alternatives →
- 10
slop-grader▲89Jev-AI CLI tool that evaluates text against custom rulesets
Sep 2026 · github.com · its alternatives →
- 11
2018 · github.com · its alternatives →
- 12
Check your wheels have the right contents. Contribute to jwodder/check-wheel-contents development by creating an account on GitHub.
2020 · github.com · its alternatives →
- 13
Greetings! A 2.5 weekends project to teach myself newer Python features (>= 3.10). Conditions are written as Lambda expressions that annotate parameters and return types, and coexist with type annotations. Symbols to share values between conditions are also supported to a limited extend.
2022 · github.com · its alternatives →
- 14
A linter to prevent exception handling antipatterns in Python (limited only for those who like dinosaurs). - guilatrova/tryceratops
2021 · github.com · its alternatives →
- 15
Stop half-done APIs! Cherrybomb is a CLI tool that helps you avoid undefined user behaviour by auditing your API specifications, validating them and running API security tests. - blst-security/cherrybomb
2022 · github.com · its alternatives →
- 16
a Pythonic toolkit for working with Boolean expressions - welchbj/tt
2017 · github.com · its alternatives →
- 17
Got bored of using other ones, so made my own. Contribute to jackfranklin/jQuery-Form-Validator development by creating an account on GitHub.
2012 · github.com · its alternatives →
- 18
Cross-platform CLI tool to validate configuration files across 18 formats. Syntax and schema validation with JSON Schema, XSD, and SchemaStore integration. Written in Go. - Boeing/config-file-validator
2023 · github.com · its alternatives →
- 19
Typer, build great CLIs. Easy to code. Based on Python type hints.
2020 · typer.tiangolo.com · its alternatives →
- 20
a Pythonic toolkit for working with Boolean expressions - welchbj/tt
2016 · github.com · its alternatives →
- 21
Wrote this to learn more about the `chumsky` parser combinator library, rustyline, and the `ariadne` error reporting crate. Such a nice DX combo for writing new languages. Still a work in progress, but I thought I'd share :)
2025 · github.com · its alternatives →
- 22
Modern ISO 8583 simulator with CLI, Python SDK, and interactive notebooks. Parse/build/validate messages at 180k+ TPS. Supports all major card networks and EMV chip data. - bassrehab/ISO8583-Simulator
Jan 2026 · github.com · its alternatives →
- 23
An open-source library for building fluent validation functions for .NET. - bsheldrick/validatum
2021 · github.com · its alternatives →
- 24
A simple, fast, extensible python library for data validation. - guyskk/validr
2016 · github.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →