Bigjpg vs OnePrompt
Side-by-side comparison · Updated September 2026
| Description | Bigjpg enlarges existing artwork, illustrations and photographs with AI reconstruction. It can smooth noise and redraw edges, but cannot guarantee that reconstructed details match the original scene. Check faces, linework, lettering and product details at the final viewing size. It is an image upscaler, not a text-to-image generator. Free allows 20 pictures per month, up to 4x enlargement and a 5MB upload. Basic costs $6 for two months with 500 pictures per month; Standard costs $12 for six months with 1,000 per month; Premium costs $22 for twelve months with 2,000 per month. All three paid packages allow up to 16x enlargement and 50MB files, with priority processing, parallel jobs and batch mode. Package duration and monthly image allowance are separate. Offline processing is available with an account, including Free. If you submit without logging in, keep the browser open while processing. The official API is available to paid members after login; check its account-specific limits before building an automated workflow. Compare VanceAI for an online credit-based workflow or a separate Windows application. The June 23, 2026 terms name Guangzhou Datu Technology Co., Ltd. as the operator and leave ownership of uploaded images with the user. You must have the rights needed to process them. The privacy policy says uploads are not used to train models and are removed from active systems within 24 hours after processing on Free, or 72 hours on Premium. It also describes cloud storage and content moderation, so this is a cloud service rather than local-only processing. Save results before the retention window ends. | OnePrompt is an advanced chatbot application designed to elevate AI chat interactions. Users can seamlessly switch between prompts using the chat screen menu and enjoy features such as saving and exporting chat logs in text format. The app supports creating new prompts, optimizing prompt parameters, and integrating with iOS functions through built-in and user-generated custom plugins. With the functionality of OpenAI's ChatGPT and extended capabilities, OnePrompt offers a comprehensive solution for efficient and personalized AI communication on iOS devices. |
| Category | Image Improvement | Chatbot |
| Rating | No reviews | No reviews |
| Pricing | Freemium | Freemium |
| Starting Price | Free | Free |
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| Tags | image upscalinganime upscalingphoto enlargementillustrationbatch processing | Advanced chatbotAI chat interactionsseamless prompt switchingsaving chat logsexporting chat logs |
| Features | ||
| AI reconstruction for photos and illustrations | ||
| Free 4x enlargement and 20 pictures/month | ||
| Paid 16x enlargement and 50MB uploads | ||
| Paid parallel processing and batch mode | ||
| Account-based offline processing, including Free | ||
| Paid-member API access | ||
| Published image-retention and model-training policies | ||
| Effortlessly create new prompts | ||
| Seamlessly switch prompts via the chat screen menu | ||
| Optimize prompt parameters for improved performance | ||
| Plugins for integrating with iOS functions like Weather, Contacts and Calendars | ||
| Support for user-generated custom plugins | ||
| Set a default prompt for automatic use | ||
| Import prompt files | ||
| Share chat logs with other applications | ||
| Save and export chat logs | ||
| Copy text by long-pressing chat bubbles | ||
| Set wallpaper on the top screen | ||
| Utilize health-specific prompts for daily life ailments | ||
| Redeem a 3-month free trial | ||
| View Bigjpg | View OnePrompt | |
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