Tools for developers — Spreadsheets

11 match your filters — 11 of them answered our check today.

Watching this group for 20 days · how we check

This week4 new arrivals

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Doesn't mention AI9Free7No sign-up4Works offline2Open source2Data stays with you3No subscription1

TenTags Studio

Live

An open-source visual table editor with a Python DSL that exports to HTML, PDF, and Excel, for developers automating dashboards and reports without hand-writing layout code.

Open sourceCan export my data
What to know▼
How it works
A live preview grid stays bidirectionally synced with Python code via an AST; design visually or write code and both update.
Best for
Developers automating BI dashboards, KPI cards, Gantt charts, or heatmaps.

Watched for 7 days · last checked 1d ago

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JSON Support

Live

A free, no-signup tool for converting JSON or CSV data into a formatted Excel file in one step.

FreeNo sign-upCan export my data
What to know▼
How it works
Paste or drop data, get a downloadable xlsx with a sortable preview before converting.
Pricing
Free, no account.
Best for
Developers and analysts turning API or database exports into spreadsheets.

Watched for 4 days · last checked today

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JSON to Excel

Live

Converts JSON data into Excel spreadsheets via a REST API or a free browser tool, preserving nested structures.

FreeNothing to install
What to know▼
How it works
REST API or browser converter turns JSON into Excel workbooks
Pricing
Free browser converter available
Best for
Developers automating JSON-to-Excel exports

Watched for 6 days · last checked today

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FreeToolDev

Live

A free, browser-based batch toolkit for developers and designers — resize/convert files, decode JWTs, and more, entirely client-side with nothing uploaded to a server.

Domain registered 27 days ago

FreeNo sign-upNothing to installData stays with you
What to know▼
How it works
A browser-based batch toolkit that processes dozens of files at once — resizing/converting/compressing images (PNG, JPG, WebP), converting CSV to JSON, decoding JWTs, and more — entirely client-side.
What's different
Most single-file tools handle one file at a time; this is built to batch-process dozens at once, with nothing uploaded to a server.
Pricing
Free.
Best for
Developers and designers who need to process many files at once without installing software or uploading data.

Watched for 13 days · last checked 2d ago

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Handiwork.tools

Live

A free set of 52 browser tools — JSON formatting, regex testing, encryption, converters, calculators — running locally so nothing uploads. Mostly developer tools, plus general productivity ones.

FreeNo sign-upNothing to installWorks offline
What to know▼
How it works
A free collection of 52 browser-based tools spanning developer utilities (JSON formatter, regex tester, JWT decoder), security tools (AES-256 encryption, PII scrubber), converters, calculators and productivity tools, all running locally in the browser.
What's different
No sign-up, no paywalls and no limits, and everything runs locally so data never leaves the device.
Pricing
Free.
Best for
Developers and general users who want quick one-off tools without installing an app.

Watched for 15 days · last checked today

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ShipMore

Live

Turns a CSV into a sellable data product, a directory, API, or feed, with Stripe checkout and SEO pages wired in, and lets coding agents run and fix it on a nightly loop before you approve changes. Self-hosted, MIT licensed, built for developers.

Open sourceSelf-hosted
What to know▼
How it works
Turns a CSV into a sellable data product — a directory, research database, API, or feed — with search, Stripe checkout, and SEO pages already wired in; a nightly agent loop checks traffic and revenue, drafts fixes, and stops for approval before anything goes live.
What's different
Agent-operable end to end via a --json CLI, MCP, and a SKILL.md that coding agents like Claude Code or Codex can read; self-hosted and MIT licensed.
Pricing
One payment; you keep your data and your own Stripe account.
Best for
Developers who want to turn a dataset into a paid product without building the commerce and SEO scaffolding themselves.

Watched for 13 days · last checked 7d ago

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AniqDev

Live

A free collection of 13 client-side developer utilities (JSON formatter, CSV-to-JSON converter, password generator, QR code generator) in English and Arabic that never send data to a server.

FreeNo sign-upData stays with you
What to know▼
How it works
Everything runs 100% client-side in the browser with no login required.
What's different
built bilingual English/Arabic; most dev tool sites only serve English.
Pricing
free.
Best for
developers, including Arabic speakers, who want quick utilities without accounts or uploads.

Watched for 12 days · last checked 8d ago

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IndexMyURL

Live

Index backlinks in Google and AI search engines

Domain registered 2 months ago

No subscription
What to know▼
How it works
A backlink indexer intended to get links indexed by Google and AI search engines like ChatGPT.

Watched for 13 days · last checked 7d ago

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CodePrettify

Live

Format, repair, query and compare JSON locally — no uploads.

FreeWorks offlineNo tracking

First seen today · last checked today

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FreeToolSpace

Live

Free, private online developer tools (JSON formatter, CSV converter) that run locally in the browser.

Free
What to know▼
How it works
Free developer tools including a JSON formatter and CSV converter that run locally in the browser.
Pricing
Free.
Best for
Developers wanting private, no-signup utilities.

Watched for 3 days · last checked 2d ago

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CheckMail1

Live

Verifies whether Gmail, iCloud, and other email addresses actually exist using browser-based login simulation.

Domain registered 3 months ago

Nothing to install
What to know▼
How it works
Uses browser automation to simulate real login attempts on Gmail, iCloud, Yahoo, Outlook, and 20+ providers, plus SMTP checks for business domains, bulk CSV upload, and API access.
What's different
Unlike verifiers that only check syntax and DNS, it can tell if a Gmail or iCloud address actually exists.
Pricing
Pay-as-you-go.
Best for
Email marketers and developers needing accurate lists.

Watched for 12 days · last checked 1d ago

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