Tools that don't upload your data — API / SDK

14 match your filters — 14 of them answered our check today.

Watching this group for 18 days · how we check

This week5 new arrivals

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Developers3

JavaScript Tools

Live

Free browser-based suite of developer utilities (JSON/HTML validation, Base64, JWT inspection, password generation) that avoids uploading data.

FreeNo sign-upData stays with you
What to know▼
How it works
Most processing happens client-side so code, tokens, and credentials aren't sent to a server
Pricing
free, no account
Best for
Developers needing quick formatting/encoding utilities without exposing sensitive data

Watched for 4 days · last checked today

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GreenBar Systems

Live

Local-first AI tooling for finance teams' monthly close (bank reconciliation, CSV sorting, PDF parsing, cash forecasting) that keeps sensitive financial data off cloud AI services.

Domain registered 2 months ago

Works offlineData stays with you
What to know▼
How it works
Local-first AI tools for finance teams' monthly close — bank reconciliation, sorting CSV line items, parsing PDFs, and building 90-day cash forecasts — without uploading sensitive financial data to cloud AI services.

Watched for 8 days · last checked 2d ago

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CodexBar Lite

Live

Lets developers monitor their OpenAI Codex usage from the macOS menu bar instead of checking a web dashboard, using only their existing CLI session.

Data stays with youOpen source

Watched for 1 day · last checked 1d ago

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Sinsubir

Live

A browser-based PDF and image conversion tool that processes files locally and never uploads them — built around privacy, not clearly a developer-only product.

Domain registered 14 days ago

Data stays with you
What to know▼
How it works
Converts and edits PDF and image files entirely in the browser without uploading them to a server, with an API also available.
What's different
Files never leave the device — processing happens 100% client-side.
Best for
People who want to convert or edit PDFs and images without uploading files to a third-party server.

Watched for 10 days · last checked 4d ago

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bypassed.me

Live

Free, no-signup toolkit of 169 diagnostics for DNS, email authentication, TLS certificates, IP blacklists and security headers, built for self-hosters debugging mail and web infrastructure.

FreeNo sign-upData stays with youSelf-hosted
What to know▼
How it works
runs DNS/SPF/DKIM/DMARC/TLS/blacklist/header checks plus in-browser dev utilities (JWT, cron, regex, hashing)
What's different
replaces juggling six separate diagnostic sites; some checks keep data local to your machine
Pricing
free to run checks; watchlists, alerts, embeddable badges and API available on top
Best for
self-hosters and sysadmins debugging DNS/email/TLS issues

Watched for 5 days · last checked 4d ago

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RakshIQ

Live

A self-hosted, offline API that detects and redacts personal data, including India-specific identifiers, before it reaches an AI model, so data never leaves your infrastructure.

Works offlineData stays with youSelf-hosted
What to know▼
How it works
Detects and redacts PII such as Aadhaar, PAN, GSTIN, IFSC, and UPI, with a Presidio-compatible drop-in API, multilingual Hindi/English name and place detection, and checksum plus libphonenumber validation to reduce false positives.
Best for
Teams building AI pipelines in or for India who can't send data to third parties.

Watched for 11 days · last checked 8d ago

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DevDash — Developer Tools, Fast

Live

17 client-side developer utilities, JSON formatter, JWT decoder, regex tester, hash and UUID generators and more, in one page, each also exposed as a REST API endpoint. No sign-up, nothing leaves your browser.

Domain registered 18 days ago

No sign-upData stays with you
What to know▼
How it works
A single page bundling 17 client-side developer utilities — JSON formatter, Base64 encoder/decoder, JWT decoder, regex tester, hash generator, UUID generator, URL encoder, timestamp converter, password generator, SQL formatter, cron parser, Markdown preview, color converter, diff tool, QR code generator, Lorem Ipsum generator, and an AI content detector — each also available as a REST API endpoint.
What's different
All processing happens client-side, so data never leaves the browser, and no sign-up is required.
Pricing
No sign-up required.
Best for
Developers who want quick access to common utilities without installing separate tools, including via API in scripts.

Watched for 13 days · last checked 10d ago

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Sonora

Live

Offline Windows speech studio offering local text-to-speech, speech-to-text and system-wide dictation with a local API.

Works offlineData stays with you
What to know▼
How it works
A Windows speech studio offering multi-engine local TTS with custom voices, speech-to-text with speaker labels, global hotkey dictation into any field, and a localhost HTTP API for scripts and AI agents.
Watch out
Runs fully offline after models download; works on GPU or CPU.

Watched for 3 days · last checked 3d ago

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RightOS

Live

An API and SDK for verifying queue position or access rights — store lines, clinic waiting, EV charging, events, package pickup — without collecting names or phone numbers. Developer infrastructure, not built around any single industry.

Data stays with you
What to know▼
How it works
An API and SDK for verifying queue position or access rights — store queues, clinic waiting, EV charging, events, package pickup — without collecting end-users' names or phone numbers. Embed via REST API, TypeScript/Python SDK, or MCP (18 tools for AI coding agents).
What's different
No names or phone numbers are held, and pricing is globally uniform with no sales negotiation.
Pricing
Free sign-up with an instant API key; globally uniform pricing.
Best for
Developers building queue or access-verification into stores, clinics, EV charging, events, or pickup services.

Watched for 17 days · last checked today

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FreeCustom.Email

Live

Instant, no-signup temporary email aliases with rotating domains to dodge blacklists, plus a public API for developers who want to build it into their own workflows.

FreeNo sign-upData stays with youOpen source
What to know▼
How it works
Creates custom, instant temporary email aliases (any inbox name) without sign-up, receiving emails in real-time from multiple rotating domains to avoid blacklists; also offers a public API and open-source frontend.
What's different
Rotating domains to avoid blacklists, plus no popups, timers, or tracking, unlike traditional temp mail tools.
Pricing
Free.
Best for
People needing disposable email for sign-up verifications or testing, and developers who want to build disposable email into their own workflows via the API.

Watched for 14 days · last checked 8d ago

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burnMSG.com

Live

A secure messaging tool for sharing passwords or sensitive notes via self-destructing links that expire after reading.

Domain registered 9 days ago

Data stays with you
What to know▼
How it works
You send passwords, API keys, notes, or other sensitive data via a self-destructing message that expires after being read or after a set time, then is permanently deleted.

Watched for 8 days · last checked 6d ago

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HyeAn 혜안

Live

A tool that searches your own image library using a plain-language description, with a Unity editor plugin and a REST API.

Data stays with you
What to know▼
How it works
Search your own image library with a plain sentence to find matching icons or photos, in about 80 languages; a Unity editor plugin assigns matched sprites directly, and a REST API covers other integrations.
What's different
Only 256px thumbnails are indexed — originals never leave your machine.
Pricing
Free tier, flat pricing, unlimited searches.

Watched for 10 days · last checked 7d ago

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Growtics

Live

A cookieless analytics dashboard combining traffic, session replay, uptime and SEO tracking, with an AI agent suggesting daily fixes. Also exposes an API and MCP server so AI coding tools can pull your site data directly.

Data stays with you
What to know▼
How it works
A cookieless analytics dashboard combining website analytics, session replays, uptime monitoring, SEO and AI-search visibility tracking and revenue insights, with an AI Growth Co-Pilot generating daily improvement tasks. Also exposes a full API and MCP server so AI tools like Claude, Codex and Windsurf can pull the data directly.
What's different
Adds an MCP server so AI coding tools can access analytics and growth data directly, and an AI co-pilot that suggests next actions rather than just showing what happened.
Best for
Website owners who want combined analytics plus concrete suggested next steps, and developers who want programmatic or AI-tool access to that data.

Watched for 18 days · last checked 2d ago

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PixelTools

Live

A free browser-based image toolkit (converter, compressor, background remover, upscaler) that processes files locally without upload.

FreeNo sign-upData stays with you
What to know▼
How it works
Bundles ten browser-based image tools (format converter, compressor, AI background remover, resizer with social presets, cropper, rotator, image-to-PDF, AI upscaler, watermark tool, screenshot beautifier) using Canvas API and WebAssembly.
What's different
Images never leave the device; no upload, account, or per-file limits; supports batch processing.
Pricing
Free.

Watched for 3 days · last checked 3d ago

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