48 questions about developer utilities.

JSON Formatter is free for one lifetime use after sign-up — no credit card required. For unlimited use, the Basic plan (£7.99/mo) unlocks it. The Free tier exists so you can try every tool once with no payment commitment.

JSON Formatter accepts up to 5 MB on Free, 50 MB on Basic / Pro, and 200 MB on Plus+. Compress the input first if it's bigger.

JSON Formatter runs entirely in your browser — your file never uploads. We only send a small usage event to count tier consumption; no file content.

Yes — JSON Formatter works on modern mobile browsers (iOS Safari 17+, Android Chrome 120+). Heavy in-browser tools (large PDFs, video) work best on desktop. A dedicated PWA ships in V2 month 4–6 for a more app-like mobile experience.

No — JSON Formatter never adds a watermark, on Free or any paid plan. The Free tier limits use to 1 per tool to fund the platform, not by watermarking.

Yes — the public API at /api/tools/* is available from Pro tier and above (£17.99/mo). 10,000 calls per month on Pro, 50k on Plus, 200k on Power, 1M on Agency. Full reference at /docs/api (V2 launch).

JSON Formatter works on the Free tier (1 use) and any paid plan unlimited. Each paid tier raises the monthly cap on the meter JSON Formatter uses.

Batch mode in the UI ships in V2 — for now JSON Formatter handles one file at a time. Pro+ subscribers with API access can build their own batch loop via the public API (10k+ calls/month available).

On the Hero 10 tools (incl. Chat with PDF, AI Resume Tailor, Background Remover, AI Headshot, Photo Restoration, Auto-Subtitle, AI Slide Deck, Image Upscaler, PDF Summarizer, AI Summarizer) — yes, we invest 60% of polish budget there. JSON Formatter is built to be 95%+ as good as the specialist tool you'd pay $20-79/mo for. On the long-tail 90 tools, JSON Formatter is 70-80% of specialist quality — sufficient for casual use.

Regex Tester + AI is free for one lifetime use after sign-up — no credit card required. For unlimited use, the Basic plan (£7.99/mo) unlocks it. The Free tier exists so you can try every tool once with no payment commitment.

Regex Tester + AI accepts up to 5 MB on Free, 50 MB on Basic / Pro, and 200 MB on Plus+. Compress the input first if it's bigger.

Regex Tester + AI runs entirely in your browser — your file never uploads. We only send a small usage event to count tier consumption; no file content.

Yes — Regex Tester + AI works on modern mobile browsers (iOS Safari 17+, Android Chrome 120+). Heavy in-browser tools (large PDFs, video) work best on desktop. A dedicated PWA ships in V2 month 4–6 for a more app-like mobile experience.

No — Regex Tester + AI never adds a watermark, on Free or any paid plan. The Free tier limits use to 1 per tool to fund the platform, not by watermarking.

Yes — the public API at /api/tools/* is available from Pro tier and above (£17.99/mo). 10,000 calls per month on Pro, 50k on Plus, 200k on Power, 1M on Agency. Full reference at /docs/api (V2 launch).

Regex Tester + AI works on the Free tier (1 use) and any paid plan unlimited. Each paid tier raises the monthly cap on the meter Regex Tester + AI uses.

Batch mode in the UI ships in V2 — for now Regex Tester + AI handles one file at a time. Pro+ subscribers with API access can build their own batch loop via the public API (10k+ calls/month available).

On the Hero 10 tools (incl. Chat with PDF, AI Resume Tailor, Background Remover, AI Headshot, Photo Restoration, Auto-Subtitle, AI Slide Deck, Image Upscaler, PDF Summarizer, AI Summarizer) — yes, we invest 60% of polish budget there. Regex Tester + AI is built to be 95%+ as good as the specialist tool you'd pay $20-79/mo for. On the long-tail 90 tools, Regex Tester + AI is 70-80% of specialist quality — sufficient for casual use.

Validates, pretty-prints, minifies. Also handles JSONC (with comments) and JSON5. No size limit on browser-side processing. Treeview visualisation ships V2.

Tests a regex against multiple input strings, highlights matches + capture groups, shows the regex in plain English (via GPT-4o-mini on Pro+). Convert English → regex with the AI Generate button.

ECMAScript (JavaScript) regex — same as your code if you're writing JS/TS. Specific to V8's regex engine; mostly compatible with PCRE but not identical.

Type your description ('match all UK phone numbers') → GPT-4o-mini produces a regex. We then test it against your sample input automatically. Available on Pro+.

Yes — every tool route at /api/tools/* is accessible via standard HTTP from Pro tier and above. 10k calls/mo on Pro, 50k on Plus, 200k on Power, 1M on Agency. Auth via Bearer token in headers.

Public OpenAPI spec lands at /docs/api in V2 (month 4-6). Until then, each tool's network call in browser DevTools is the de facto reference.

Monthly cap per tier (above). On top of that, soft throttle of 50 req/min per user to keep the platform fast for everyone. Hitting the per-minute limit returns 429 with a Retry-After header.

Standard Bearer token. Generate one at /app/settings → API access. Pass as `Authorization: Bearer <token>` header.

Yes for same-origin (your-domain.com → your-domain.com). For cross-origin (your-domain.com → apexkit.pro), use the server-side pattern with your secret API key.

Webhook callbacks on long-running tools (Whisper transcription, Slide Deck, AI Headshot) ship V2. Current API is sync-only.

TS SDK ships V2 alongside the OpenAPI spec. For now, fetch with proper types works fine.

Python SDK ships V2 after the TS SDK. For now, plain `requests` calls work — the API is REST.

Yes — pass `idempotencyKey: '<uuid>'` in the request body for tool calls. Prevents double-billing on retries.

On the 1st of each calendar month at 00:00 UTC. Same as web-UI counters.

Chat with PDF streams answers in chunks. Other AI tools return final output in one response. SSE streaming for long-form (Slide Deck, PDF Summarise) ships V2.

200 OK · 400 bad input · 401 unauth · 402 monthly cap reached · 413 file too large · 429 rate limited · 500 internal · 502 upstream model failed.

JSON body: `{ok: false, reason: 'monthly_cap_reached', upgrade: 'Pro', cap: 200}`. Programmatic clients can branch on this to trigger an upgrade flow.

Yes — all file uploads via standard multipart/form-data. JSON-only endpoints (text input) use application/json.

Sign up → /app/settings → generate an API key → curl with `Authorization: Bearer <key>`. The simplest test endpoint: `POST /api/tools/writing/summarize` with a text body.

Bundled into your monthly cap — no per-call cost. Once your monthly cap is hit, calls return 402; upgrade tier or wait for the next month.

Not yet — browser-rendering / screenshotting tool ships V2. For now, use Playwright / Puppeteer in your own code; we can integrate later.

Sharp via Next.js Image component for static. For tool-side image processing, we use a mix of canvas (browser) + libvips (server) + Replicate models for AI.

No — Apexkit is closed-source SaaS. The bundle of integrations + the AI cost optimisation is part of what makes it work at this price point.

Sider-AI-style extension ships V2 month 4-6 — pin Apexkit's most-used tools to a sidebar, available in every tab.

Zapier + Make + n8n integrations ship V2 alongside the public API. Until then, use the API directly from any of these via their HTTP / webhook actions.

Native Make module ships V2. For now, use Make's HTTP module pointing at our API endpoints.

Yes — via Apps Script + UrlFetchApp. Example snippet in our V2 SDK docs. Today: roll your own with the API key.

Yes — V2 launch comes with 5-10 'starter' Zaps (e.g. transcribe-then-summarise, compress-PDF-on-upload, daily-LinkedIn-rewrite).

Background Remove → product photo integration ships V2 as a Shopify app. Same workflow on WordPress (V2 plugin).

WordPress plugin ships V2 — auto-OCR / auto-compress on Media Library uploads. Bundles Apexkit auth + tier directly.