# LightFill vs Sider

LightFill records 0 monthly visits with — month-over-month growth and Contact for Pricing pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.

| Metric | [LightFill](https://openaitools.app/tool/lightfill) | [Sider](https://openaitools.app/tool/sider) |
| :--- | :--- | :--- |
| Website URL | https://chromewebstore.google.com/detail/lightfill/hfjglbjcneghejbdakkleggpefippgjj | https://sider.ai |
| Categories | AI Forms, AI Document Extraction | AI Assistant, AI Chatbot, AI Writing Assistants, AI Reader |
| Pricing Model | Contact for Pricing | Freemium |
| Monthly Visits | 0 | 2,644,740 |
| MoM Growth Rate | — | -10.6% |
| Primary Market | Global | United States |
| Direct Visits | 0 | 1,699,535 |
| Review Score | 3.5 | 4.5 |
| Saved Count | 1 | 31 |
| Supported Platforms | Browser Extension | Website |

## LightFill

LightFill targets a very specific annoyance: you have the document and you have the form, and the only thing in the way is re-typing data that already exists. The extension is designed to close that gap. Instead of copying a passport number or an invoice total across by hand and hoping you did not transpose two digits, you let the extension extract the values with AI-based document processing and fill the form for you in one action.

Its developer describes support for a range of document and form types — identity papers, passports and invoices are the examples given — with the goal of working across the many layouts administrative and purchasing forms come in. Because the extension touches identity documents, the listing emphasises security protocols for protecting personal data, and the developer's disclosure notes that it handles personally identifiable information, financial and payment information, authentication information and website content, while stating the data is not sold to third parties.

It is a small, single-purpose tool rather than a suite: published by an independent developer based in France, listed under Tools, and last updated in 2024. The extension itself is free to install and the store listing notes that it offers in-app purchases. If your work involves paperwork — visa and onboarding forms, expense claims, invoice entry — it is aimed squarely at how much of that day disappears into typing.

**Pricing & Plans:** Free to install from the Chrome Web Store; the listing notes that the extension offers in-app purchases. No standalone public pricing page is published.

- **AI document extraction:** Reads structured values out of ID cards, passports, invoices and other documents instead of asking you to type them.
- **One-click form filling:** Maps extracted values into the fields of the web form you are looking at, so a completed form is one action away.
- **Broad document and form coverage:** Built to handle multiple document layouts and the varied field arrangements of administrative and checkout forms.
- **Time saved on repetitive entry:** Removes the slow, mistake-prone copy-typing that dominates routine paperwork and online purchasing.
- **Security-focused handling:** The developer highlights protection of personal data and discloses which categories of information the extension processes.

**Strengths:** Removes a genuinely tedious, error-prone task with a single click; Handles several practical document types, including ID cards, passports and invoices; Free to install, with the option of in-app purchases as needed; Open about what data categories it processes and states data is not sold to third parties

**Limitations:** Available only as a Chrome extension, so other browsers are not covered; Handling identity and payment documents makes reading its privacy disclosure essential before use; A small independent tool with a limited public track record and no standalone product site

[Profile (Markdown)](https://openaitools.app/tool/lightfill.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 LightFill and Sider compare in monthly traffic?

LightFill has 0 monthly visits, while Sider has 2,644,740. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

LightFill has a month-over-month growth rate of —; Sider has -10.6%.

### How does pricing compare?

LightFill: Contact for Pricing. Free to install from the Chrome Web Store; the listing notes that the extension offers in-app purchases. No standalone public pricing page is published. 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 | [Fillout](https://openaitools.app/tool/fillout-com) | 3,923,917 | -9.7% | Freemium | Build powerful forms, surveys and quizzes with AI in minutes | [.md](https://openaitools.app/tool/fillout-com.md) |
| 5 | [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) |
| 6 | [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) |
| 7 | [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) |
| 8 | [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) |
| 9 | [Voilà — AI Assistant, Chat and Writer](https://openaitools.app/tool/voil-chatgpt-browser-assistant) | 152,170 | -4.8% | Freemium | Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools. | [.md](https://openaitools.app/tool/voil-chatgpt-browser-assistant.md) |
| 10 | [Instafill.ai](https://openaitools.app/tool/instafill) | 35,630 | -36.6% | Free Trial, Paid, Contact for Pricing | AI that fills your PDF and Word forms for you | [.md](https://openaitools.app/tool/instafill.md) |

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

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