| Field | AI Horde | OCR.space |
|---|---|---|
| Type | Ongoing free tier · perpetual | Ongoing free tier · renewing-quota |
| What's free | Free crowdsourced text & image generation; anonymous API key '0000000000' (no registration), or register to earn kudos for priority | 25,000 conversions/month (Engine 1 & 2) plus 1,000 Engine 3 conversions/month; max 1 MB file, PDFs up to 3 pages |
| Rate limits | Queue-based priority via kudos (no fixed quota); anonymous requests get lowest priority under load | 500 requests per day per IP address |
| Expires | no expiry | no expiry |
| The catch | Community-powered volunteer network — model availability and speed vary with worker supply, so it is not a fixed-SLA service. No card, no phone. Kudos never expire and cannot be sold. | Free searchable-PDF output carries a watermark (raw text extraction is unrestricted); the free key needs only an email, no card. Commercial use permitted. |
| Credit card | not required | not required |
| Phone verification | not required | not required |
| Commercial use | not confirmed | allowed |
| OpenAI-compatible | no | no |
| Modalities | text, image | ocr, text |
| Free models (sample) | no sample | no sample |
| Official docs | aihorde.net/ | ocr.space/OCRAPI |
| Last verified | 2026-10-08 | 2026-10-08 |