Dart vs. OneSchema vs. Integrate.io vs. Flatfile vs. building in-house for employer eligibility files

The short version

• Choose OneSchema if you want your operations team to map and validate employer files in its own tool, plus an importer embedded in your app.
• Choose Integrate.io if you want a general ETL platform at a fixed monthly price and you're comfortable building pipelines, or paying its team to build them.
• Choose Flatfile if your main need is a data import or migration workspace you share with customers. It doesn't publish a benefits or eligibility offering.
• Build in-house if eligibility handling is part of the product you sell and you have spare data engineering capacity.
• Choose Data Nexus by Dart Health if you'd rather not staff eligibility operations at all. Dart's specialists run intake and exceptions, and your product reads one API.

Everything below about other vendors comes from their public websites as of October 24, 2026. Where a vendor's site doesn't say, we say so rather than guess.

Who runs the feeds

• Data Nexus by Dart Health: Dart's specialists set up each feed, check every map, and keep mappings current when a client changes systems.
• OneSchema: software your team operates. Its FileFeeds product lets your operations team build pipelines by chatting with AI. Pro plans include 60 days of implementation support, and Enterprise adds a dedicated CSM and implementation.
• Integrate.io: either side. Its site says your team can build pipelines after training, or its team builds and runs them to your spec.
• Flatfile: a shared workspace for you and your customers. Implementation services are listed on its Enterprise plan. Flatfile now operates under the name Obvious.
• In-house: your engineers build and maintain every feed.

Who decides when a file is wrong

• Data Nexus: AI proposes the likely cause, a person on Dart's team decides, and Dart contacts the sender when the fix belongs to them. A bad record stops only that record. A file-wide problem stops the file.
• OneSchema: its site doesn't say who handles exceptions. It says recurring drops process without manual intervention.
• Integrate.io: pipelines reject malformed or blank files and alert you. Its site doesn't say who works the fix with the sender.
• Flatfile: your team. Every AI or user change is surfaced for review.
• In-house: your team.

Validation

• Data Nexus: 5 layers of checks on every record: type and range, duplicates, consistency across a member's records, deviation from the prior file, and a change threshold that catches mass changes.
• OneSchema: validates member, dependent, and coverage data against your business rules, including coverage dates, dependent relationships, and duplicate identifiers. A comparison against the prior file isn't stated.
• Integrate.io: normalizes names, dates, and phone numbers, dedupes on member ID, and rejects malformed files. A comparison against the prior file isn't stated.
• Flatfile: flags missing fields, incorrect formats, and unexpected values. A comparison against the prior file isn't stated.

Formats and delivery

• Data Nexus: CSV, flat file, HRIS export, or API payload over SFTP, webhook, or API, plus 834 EDI on Enterprise plans. Delivers one documented JSON API, or a separate feed for each downstream partner with only the fields it needs.
• OneSchema: files over SFTP, files.com, and other methods, from HRIS sources such as Workday, ADP, Gusto, UKG, Paylocity, and Ceridian. 834 support and outbound partner feeds aren't stated.
• Integrate.io: CSV, Excel, fixed-width, TXT, XML, JSON, or X12 834, over SFTP, email, cloud storage, or API. Sends 834, fixed-width, or CSV files to partners on each one's schedule.
• Flatfile: uploads, APIs, webhooks, databases, and cloud storage. SFTP, 834 support, and partner feeds aren't stated.

Identity resolution and history

• Data Nexus: resolves each member across eligibility, claims, and program files without a shared ID, at over 99% on about 3 million records a month. Keeps member-level history with arrival dates: 6 months on Starter, 6 to 12 months on Pro, and unlimited on Enterprise.
• OneSchema: deduplication is stated, and matching members across sources isn't. Default data retention is 7 days.
• Integrate.io: dedupes on member ID. Files pass through and aren't kept, so member history stays with you.
• Flatfile: data version history and audit trails are listed on its Enterprise plan. Identity resolution isn't stated.

Compliance

• Data Nexus: HIPAA compliant, signs BAAs, and independently audited for SOC 2 Type II.
• OneSchema: SOC 2 Type 2, SOC 3, GDPR, CCPA, and HIPAA, with a standard BAA.
• Integrate.io: signs a HIPAA BAA and is SOC 2 compliant. HIPAA and healthcare readiness is listed as a plan option.
• Flatfile: SOC 2 Type II and ISO 27001 certified, and described as HIPAA ready. A BAA isn't stated.

Pricing

• Data Nexus: published and priced by feeds and monthly record updates, not covered lives. Validation is $2,990 a month for the trial with 3 feeds, Starter is $4,990 a month with 15 feeds, Pro is $6,990 a month with 50 feeds, and Enterprise is quoted. See pricing.
• OneSchema: contact sales.
• Integrate.io: Core starts at $1,999 a month, a fixed fee rather than a per-member price.
• Flatfile: not published. Its site says pricing is based on project volume.
• In-house: at least one engineer's fully loaded cost, which grows with every client feed. See build vs. buy.

Sources

• OneSchema: employee eligibility, security, pricing
• Integrate.io: insurance and benefits, point solutions, pricing
• Flatfile: home, services, pricing, security