Fuse alternative at a flat $19 with no per-cell or per-file fees
Updog charges one price per production domain, whether your users import ten thousand cells a month or ten million. Adding a domain is the only thing that moves the bill.
100% client-sideWhite-labelFlat $19/domain/month
Updog and Fuse at a glance
| Dimension | Updog | Fuse |
|---|---|---|
| Data privacy | Files are parsed, validated, and edited in the browser. Row data never reaches Updog's servers, so there is no data processor, DPA, or residency to manage. | Files are parsed in the browser, inside a frame Fuse serves. By default the rows are posted to Fuse and kept, and your app reads them back through an API that lists past imports and pages through their records; its comparison pages say Fuse never stores imported data. Incognito Mode is an opt-in setting that keeps rows out, at the cost of the API and the webhooks, though the file's headers still reach Fuse on every import, with sampled values from any dropdown column. HIPAA with a signed BAA, GDPR, and CCPA are claimed, with no SOC 2 or ISO 27001 found. |
| White-label | Full styling through CSS variables and class overrides. No Updog logos or "powered by" on any plan, including the free one. | Five colors and your own logo, set in code or in the dashboard. The importer renders in a cross-origin frame, so your own stylesheet never reaches it. The product page offers to change fonts, which the documented API does not cover. White labelling starts on the Professional plan. |
| Pricing | Free for development, and a 14-day trial with no card when you go live. In production, a flat $19 per domain per month, the same at any volume, and your first paid domain includes a free one for staging. | Public and metered. Standard starts at $79 a month and Professional at $199, each including 10 million cells and 100 files, then $2 per extra million cells and $1 per extra file. Standard allows one importer, so one column schema. Enterprise is quoted. A free trial replaces a free plan, and stops each import at 100 records. |
| Data mapping | Schema in code. Fuzzy column matching with a built-in synonym dictionary you can extend, or connect the AI your organization already approves through a hook, so it runs on infrastructure you control with no new AI vendor to clear. Updog keeps no mapping history. Your app owns that state and can supply saved selections on later imports. Maps incoming values to your options. Auto-detects number and date formats. Combines files by upserting on a key. | Columns live in an Importer built in Fuse's dashboard, or are added from code. Matching runs on Fuse's servers. The file's headers and a sample of its values are posted to Fuse, which returns suggested column and value mappings for the user to confirm. Fuse saves the confirmed mappings back onto the Importer and reuses them on the next import. |
| Data cleaning | Cells edit inline through a typed editor per column, text, number, date, select, or multi-select, with clipboard, fill handle, and full undo and redo. Values pass a transform on the way in, then validation runs at three levels, built-in rules, your own checks, and asynchronous ones. Sorting, full-text search, filters on the columns you enable, and formulas. Invalid rows can block submit or come through flagged. Any view also exports in any supported format. | A spreadsheet-style review grid with inline editing, find and replace with regular expressions, and undo and redo over the last fifteen changes. Ten column types carry built-in checks, and a rule you write can block a row or only warn. Errors from your own backend come back into the grid cell by cell mid-import. Built-in transformations trim, change case, round, and reformat dates. Developers can add bulk actions, and invalid rows can block submission. |
| Scale & performance | About one million rows at around 20 columns in the browser, with a filter on every column. No fixed row cap, the browser tab's memory is the ceiling, and fewer columns reach further. Filtering and sorting run in a worker, measured at 30 to 250 milliseconds over a million rows. | Runs in the browser and holds the whole file in memory, then posts the rows to Fuse on submit. CSV parses in a web worker, Excel on the main thread with a memory-saving mode above 20 MB. Uploads stop at 100 MB for CSV and 50 MB for Excel, one file at a time. No row limit is published. |
| Integration | React component, plus a Web Component for Vue, Angular, Svelte, and vanilla JS. Renders inline in your page's DOM. Imports CSV, TSV, Excel, JSON, and XML, plus any other format through a parser you register yourself. | One npm package covers React, Angular, Vue, and plain JavaScript. It opens as a full-screen frame on Fuse's domain rather than an element in your page. The picker takes one CSV or Excel file at a time, while the product page also lists TSV. Your backend has to mint a session token before it will render. |
| Languages & RTL | English by default, with every interface string overridable, so you can localize into any language. Right-to-left is first-class. It flips layout, text alignment, scrollbars, and column pinning, and carries through to export. | Five interface languages, English, German, French, Spanish, and Italian, loaded from the browser's setting. Adding your own is not documented, and no right-to-left support was found. |
| Accessibility | An ARIA grid with full keyboard navigation and screen-reader support. WCAG 2.2 AA is the level Updog builds to, with automated rule checks over every component and every step of the importer on each test run. Updog holds no independent audit or VPAT. | Dialogs, tabs, and controls carry roles and labels from the library underneath, while the review grid has no grid semantics. No accessibility statement was found. |
Fuse is sold by Swovo, formerly Flatirons Development. Its marketing pages moved to swovo.com, while the dashboard, the importer frame, and the npm package still run on flatirons.com. Facts checked against Fuse's public pages in August 2026.
Which one fits your team
Fuse may fit better if
- You need HIPAA compliance with a signed BAA.
- You want the vendor to set the whole thing up for you.
- You want AI matching hosted by the vendor, with no endpoint of your own to connect.
- You want the importer hosted by Fuse and updated without a release on your side.
- You want an import history you can query by API later, with webhooks when one lands.
Updog may fit better if
- You want an importer and spreadsheet editor embedded in your own app.
- You want to match your app's design exactly, styling the editor with your own CSS through variables and class overrides.
- You want to handle large files in the browser, with nothing stored on a server.
- You want flat, public pricing with no per-import fees.
- You want to use the AI your organization already approves, with no new vendor to clear.
Questions people ask
Is Updog a drop-in replacement for Fuse?
No. Both embed an import flow with a spreadsheet-style review grid, but Fuse renders in a frame served from its own domain and sends the rows to its servers by default, while Updog renders in your page and has no server at all.
How do the two handle data privacy?
Updog has no server mode, so row data never leaves the browser. Fuse parses in the browser too, then posts the rows to its servers to store, unless you turn on Incognito Mode, which keeps them out and turns off its API and webhooks.
How does Updog pricing compare?
Updog is a flat $19 per production domain per month, free in development. Fuse starts at $79 a month for Standard and $199 for Professional, with Enterprise quoted.
Can Updog handle large files like Fuse?
Yes, about 1 million rows in the browser, bound by the machine's memory. Fuse publishes no row limit but stops an upload at 100 MB for CSV and 50 MB for Excel.
Does either one need a backend?
Updog does not, on any plan. Fuse does. A session token has to be minted before the importer will render, and the client-side way of minting it exposes your API key, so the docs limit that to testing and internal tools.
Does Updog have built-in AI mapping like Fuse?
No. Updog uses fuzzy matching with a synonym dictionary you can extend, and can call an AI endpoint you control. Fuse posts your file's headers and a sample of its values to its own matching service.
Can Updog be used to view or edit existing data, without an import?
Yes. Load existing data straight into Updog's editor to view and edit it, with a read-only mode. Fuse can do this too, by setting its records option to skip the upload step.
How do the two handle accessibility?
Updog's grid uses ARIA semantics with full keyboard navigation and screen-reader support, and the importer is checked against WCAG 2.2 A and AA rules on each test run. Updog holds no independent audit or VPAT. Fuse's dialogs, tabs, and controls carry roles and labels from the library underneath, while its review grid has no grid semantics, and no accessibility statement was found.
Can the interface be translated, and does right-to-left work?
Updog ships in English with every interface string overridable, so you can localize into any language, and it renders right-to-left layouts natively. Fuse loads five interface languages from the browser's setting, English, German, French, Spanish, and Italian, with no documented way to add your own, and no right-to-left support was found.
See how Updog compares to other CSV importers
Try Updog for free
Install the package, add your columns, render the component. Free on localhost and preview domains. Every feature included.