# Prompastic vs Sider

Prompastic records 1,093 monthly visits with -7.1% month-over-month growth and Free pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.

| Metric | [Prompastic](https://openaitools.app/tool/prompastic) | [Sider](https://openaitools.app/tool/sider) |
| :--- | :--- | :--- |
| Website URL | https://prompastic.ai | https://sider.ai |
| Categories | AI Prompt Generator, Prompt Engineering | AI Assistant, AI Chatbot, AI Writing Assistants, AI Reader |
| Pricing Model | Free | Freemium |
| Monthly Visits | 1,093 | 2,644,740 |
| MoM Growth Rate | -7.1% | -10.6% |
| Primary Market | Russia | United States |
| Direct Visits | 410 | 1,699,535 |
| Review Score | 4.2 | 4.5 |
| Saved Count | 0 | 31 |
| Supported Platforms | Website | Website |

## Prompastic

Prompastic is a web-based prompt generation platform for people who work with modern generative models and want their prompts to be structured rather than improvised. The site is organised around specialised engines: a universal image generator that can target Midjourney, Stable Diffusion, SDXL, DALL-E 3 and Flux, a video generator that handles camera movement, scene setup, lighting and pacing, a ChatGPT content generator for marketing, social and business writing, a system and agent generator for roles, constraints and behavioural rules, and a LoRA dataset generator for training variations across pose, outfit, background and lighting.

What separates Prompastic from simple text expanders is the handling that happens underneath the interface. You are not expected to memorise model weights or version numbers, because the system manages the technical syntax internally and validates the prompt for the chosen model before you generate. Professional-grade defaults are applied so that common artifacts and low-quality output are avoided, and logical conflicts - the classic photorealistic anime example - are resolved silently rather than wasting generations.

Alongside the generators, Prompastic maintains a Prompt Library of curated examples across all categories and a blog that digs into prompt engineering techniques, such as five tweaks that measurably improve output consistency. The workflow is deliberately short: choose a generator, describe your core concept, and generate. No login is required and inputs are not stored, which keeps experimentation fast. The platform is aimed at designers, marketers, developers and creators, and it presents itself as a practical workspace of tools and references rather than a promise of guaranteed results.

**Pricing & Plans:** Prompastic states that it offers a free tier for all of its generators, and no login is required to use them. Inputs are not stored. No paid subscription tiers are published on the website.

- **Universal image prompt generator:** Describe a concept once and get a clean composition, correct style application and reduced artifacts. Syntax is adapted automatically for Midjourney, Stable Diffusion, SDXL, DALL-E 3 or Flux.
- **Video prompt generator:** Structured video prompts cover camera movement, scene setup, lighting and atmosphere so motion clips stay temporally coherent with professional pacing.
- **ChatGPT content prompt generator:** Build context, set tone and apply marketing frameworks to produce clear briefs for writing, social media and business copy, with support for scaling output.
- **System and agent prompt generator:** Define roles, behavioral rules, constraints and output formatting to create personas and system instructions for custom GPTs and AI agents.
- **LoRA dataset prompts:** Generate batches of training prompts with variations in pose, outfit, background and lighting, with control over variation sets and exports.
- **Prompt library and insights:** A curated library of reusable examples across every category, plus blog deep dives into prompt patterns and practical tweaks that improve consistency.

**Strengths:** Free to use with no login required; Five specialised generators cover image, video, text, agent and LoRA workflows; Internal syntax handling means you do not need to memorise model version strings; Smart negative prompts and conflict resolution reduce failed generations

**Limitations:** Outputs are structured prompt drafts, so final quality still depends on the model you paste them into; Advanced users may find the guided fields more rigid than hand-writing prompts; No visible paid tier or team features documented on the site; Only static generative examples - no built-in image or video rendering

[Profile (Markdown)](https://openaitools.app/tool/prompastic.md)

## Sider

Sider's premise is that you should not have to leave the page you are reading to use an AI assistant. Its sidebar overlays the browser, detects the content in view, and responds with chat, summaries, translations or explanations using frontier models from multiple providers. The result is a lightweight research and reading workflow: highlight a paragraph, ask for a simpler explanation, translate a PDF and keep the original in sight.

Recent versions push Sider beyond chat. Sider Hand is a browser agent that works across real websites and uses your logged-in sessions to carry out multi-step jobs such as comparing prices while shopping, filling forms, doing cross-site research or triaging a Gmail inbox. Sider Code goes the other way, letting you instruct changes to a website's appearance or behaviour in plain language and preserving the customisation for next time. A Create module generates images, videos, slides and documents from the same panel.

Pricing moves from a limited free tier to credit-based paid plans aimed at heavier users. Lower plans suit occasional chat, summarisation and translation, while higher tiers add a dedicated cloud computer that keeps the browser agent running around the clock and a larger monthly credit allowance. Sider ships as browser extensions for Chrome and Edge plus desktop and mobile apps for macOS, Windows, iOS and Android, and is used by a very large installed base.

**Pricing & Plans:** Freemium. Free tier available with limited credits; paid plans advertised at roughly US$10/month for occasional use up to around US$100/month at the top tier, with higher credit allowances and a dedicated cloud computer on the upper plans.

- **AI sidebar on any page:** A persistent panel that reads the page you are on and answers follow-ups with GPT, Claude or Gemini without copying content into another tab.
- **Summarise and chat with documents:** Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
- **Translation and read-aloud:** Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
- **Sider Hand browser agent:** Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
- **Sider Code page customisation:** Describe a change in plain words and have Sider restyle or simplify any website, remembering the modification for future visits.

**Strengths:** Works inside the browser you already use, with no context switching; Access to multiple frontier models from one subscription; Strong reading toolkit: PDF chat, YouTube summaries, translation and read-aloud; Increasingly capable agent features for multi-step browser tasks

**Limitations:** Useful credits run out quickly on the free and lower tiers; Model availability and quota rules change over time, so expectations must be checked per plan; Some agent and code features depend on a cloud machine and heavier plans

[Profile (Markdown)](https://openaitools.app/tool/sider.md)

## Frequently Asked Questions

### How do Prompastic and Sider compare in monthly traffic?

Prompastic has 1,093 monthly visits, while Sider has 2,644,740. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Prompastic has a month-over-month growth rate of -7.1%; Sider has -10.6%.

### How does pricing compare?

Prompastic: Free. Prompastic states that it offers a free tier for all of its generators, and no login is required to use them. Inputs are not stored. No paid subscription tiers are published on the website. Sider: Freemium. Freemium. Free tier available with limited credits; paid plans advertised at roughly US$10/month for occasional use up to around US$100/month at the top tier, with higher credit allowances and a dedicated cloud computer on the upper plans.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [ChatGPT](https://openaitools.app/tool/chatgpt-4) | 6,048,022,723 | +2.2% | Freemium | OpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research. | [.md](https://openaitools.app/tool/chatgpt-4.md) |
| 2 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Anthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing. | [.md](https://openaitools.app/tool/claude-2.md) |
| 3 | [Monica](https://openaitools.app/tool/monica-ai) | 4,512,775 | -11.3% | Freemium | Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools. | [.md](https://openaitools.app/tool/monica-ai.md) |
| 4 | [Merlin AI](https://openaitools.app/tool/merlin-ai) | 1,382,634 | +13.1% | Freemium | Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features. | [.md](https://openaitools.app/tool/merlin-ai.md) |
| 5 | [Prompt Cowboy](https://openaitools.app/tool/prompt-cowboy) | 1,130,450 | -22.4% | Freemium | Turn lazy prompts into great ones and get more out of any large language model | [.md](https://openaitools.app/tool/prompt-cowboy.md) |
| 6 | [Image Prompt](https://openaitools.app/tool/image-prompt) | 608,804 | +16.1% | Freemium, Paid | AI toolkit for writing, enhancing and reversing image prompts | [.md](https://openaitools.app/tool/image-prompt.md) |
| 7 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider. | [.md](https://openaitools.app/tool/harpa-ai.md) |
| 8 | [PrompTessor](https://openaitools.app/tool/promptessor) | 321,329 | +84.2% | Freemium | Analyze, optimize and organize prompts in one AI workspace | [.md](https://openaitools.app/tool/promptessor.md) |
| 9 | [Glarity](https://openaitools.app/tool/glarity-summarize-google-and-youtube) | 188,823 | -49.6% | Freemium | Summarize YouTube, Google, and any page with AI — free in your browser | [.md](https://openaitools.app/tool/glarity-summarize-google-and-youtube.md) |
| 10 | [Kome AI](https://openaitools.app/tool/kome-ai) | 174,910 | -6.5% | Freemium | Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider. | [.md](https://openaitools.app/tool/kome-ai.md) |

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Source: https://openaitools.app/compare/prompastic-vs-sider

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