Is Ably or Codat better?

Neither clearly leads. Ably starts at Free and Codat at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Ably or Codat?

Ably has a free tier; the other does not. Paid plans start at Free for Ably and On request for Codat.

Does Ably or Codat run on more platforms?

Ably runs on web, ios, android, api. Codat runs on API, Web.

Can I use Ably for free?

Yes. Ably has a free tier, so you can try it without paying. Codat starts at On request.

What is Ably best used for?

Ably is most often used for building realtime chat or collaborative apps, delivering live data feeds like stock prices or sports scores, broadcasting notifications to many concurrent clients, running mission-critical realtime infrastructure with high uptime slas. Of those, building realtime chat or collaborative apps and delivering live data feeds like stock prices or sports scores are not what Codat is typically brought in for.

What can Ably do that Codat cannot?

Ably covers Pub/sub messaging, Presence, Message persistence, Multi-protocol support. Codat covers Normalised accounting API, Banking and commerce data, Lending products, Write-back.

APIs · head to head

Ably vs Codat

Ably

APIs

Realtime data delivery platform for pub/sub messaging at scale

From: Free
Rated: -

Full review Website

Codat

APIs

One API for small business accounting, banking and commerce data

From: On request
Rated: -

Full review Website

The short version

Only Ably has a free tier, so it costs nothing to try first.
Each has a real cost: Ably standard and Pro plans layer usage-based charges for messages, connection minutes, and data transfer on top of the base subscription, adding cost complexity.; Codat the accounting platforms are metering developer access themselves, with Xero introducing tiered connection based developer pricing from 2 March 2026, so a cost you do not control has been inserted between you and the data and it scales with the number of customers you connect.
They diverge on capability: Ably covers Pub/sub messaging, Codat covers Normalised accounting API.
Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Ably and Codat actually diverge.

Attributes where Ably and Codat differ
Attribute	Ably	Codat
Starting price	Free	On request
Pricing model	freemium	quote
Free tier	Yes	No
Platforms	web, ios, android, api	API, Web

Identical on both: user rating (Not yet rated), category (APIs).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Ably

Pub/sub messaging
Presence
Message persistence
Multi-protocol support
Encryption
Datadog integration

Only in Codat

Normalised accounting API
Banking and commerce data
Lending products
Write-back
Business verification
Supplier onboarding
Connection management
Data quality handling

What people use each for

The jobs each tool is most often brought in to do.

Ably

Building realtime chat or collaborative appsnot Codat
Delivering live data feeds like stock prices or sports scoresnot Codat
Broadcasting notifications to many concurrent clientsnot Codat
Running mission-critical realtime infrastructure with high uptime SLAsnot Codat

Codat

A business lender that wants live ledger data for underwriting rather than a borrower emailing exported PDF accountsnot Ably
A commercial bank monitoring covenant compliance across a portfolio of small business borrowers continuously rather than quarterlynot Ably
A payment company verifying a merchant trading history before extending working capitalnot Ably
A B2B platform writing bills and payments back into a customer accounting system so reconciliation happens automaticallynot Ably

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Ably

Standard and Pro plans layer usage-based charges for messages, connection minutes, and data transfer on top of the base subscription, adding cost complexity.
The jump from Standard ($29/month) to Pro ($399/month) is steep for teams needing more than 10k connections but not full Pro capacity.
24/7 mission-critical support and 99.999% uptime SLAs are reserved for the custom-priced Enterprise tier.

Codat

The accounting platforms are metering developer access themselves, with Xero introducing tiered connection based developer pricing from 2 March 2026, so a cost you do not control has been inserted between you and the data and it scales with the number of customers you connect.
Pricing is opaque and enterprise shaped for a product developers expect to evaluate technically first, so build decisions get made before anyone knows the unit economics.
Normalisation hides but does not remove the underlying differences between accounting systems, and edge cases in multi-currency, journals and tax handling surface as data quality problems that your team must reason about in each source system anyway.
Data quality depends on the small business keeping its books properly, so a lender using ledger data for underwriting inherits the bookkeeping standard of its worst borrower and needs its own validation layer regardless.
Connection breakage from expired tokens and platform API changes is an ongoing operational load, and a borrower whose connection lapses stops being monitored silently, which is the failure mode that matters most in a lending portfolio.

Pricing, plan by plan

Ably

Free

FreeFree
- 200 concurrent connections
- 500 messages/second
- 6M messages/month
Standard$29/month
- 10k concurrent channels
- 10k concurrent connections
- 2.5k messages/second
Pro$399/month
- 50k concurrent channels
- 50k concurrent connections
- 10k messages/second

Codat

On request

Codat Platform$undefined/year
- Priced by connected companies, data types and products
- Lending and verification products priced above core data access
- Annual enterprise agreements

Which should you pick?

Choose Ably if

You need pub/sub messaging.
You want to start without paying.
You work on web, ios, android, api.
You also want presence.

Ably review

Choose Codat if

You need normalised accounting api.
You work on API, Web.
You also want banking and commerce data.

Codat review

Questions people ask

Is Ably or Codat better?: Neither clearly leads. Ably starts at Free and Codat at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ably or Codat?: Ably has a free tier; the other does not. Paid plans start at Free for Ably and On request for Codat.
Does Ably or Codat run on more platforms?: Ably runs on web, ios, android, api. Codat runs on API, Web.
Can I use Ably for free?: Yes. Ably has a free tier, so you can try it without paying. Codat starts at On request.
What is Ably best used for?: Ably is most often used for building realtime chat or collaborative apps, delivering live data feeds like stock prices or sports scores, broadcasting notifications to many concurrent clients, running mission-critical realtime infrastructure with high uptime slas. Of those, building realtime chat or collaborative apps and delivering live data feeds like stock prices or sports scores are not what Codat is typically brought in for.
What can Ably do that Codat cannot?: Ably covers Pub/sub messaging, Presence, Message persistence, Multi-protocol support. Codat covers Normalised accounting API, Banking and commerce data, Lending products, Write-back.

Answered from the vendors’ own pages

Ably: What does Ably cost?

Ably offers a free plan with 200 concurrent connections, a Standard plan at $29/month plus usage, a Pro plan at $399/month plus usage, and custom Enterprise pricing with unlimited channels and connections.

Source

Codat: What is changing with Xero in 2026?

Xero is introducing a tiered, usage based developer pricing model effective 2 March 2026, with tiers based on the number of customer connections an app holds. That is a new cost in the chain for anyone reading Xero data at scale, whether directly or through Codat.

Ably: Is there a free plan, and what are its limits?

Yes, the free plan includes 200 concurrent connections, 500 messages per second, and 6 million messages per month with community and best-effort email support.

Source

Codat: Can Codat write data back?

Yes. It supports pushing bills, payments and journal entries into accounting systems, not only reading from them.

Ably: How is usage metered?

Beyond plan limits, Ably charges usage-based rates of $2.50 per million messages, $1.00 per million connection minutes, $1.00 per million channel minutes, and $0.25 per GiB of data transfer, with volume discounts available.

Source

Codat: Is pricing published?

No. It is quoted by connected companies, data types and products, and users consistently describe it as opaque.

Codat: Does it replace bank data aggregation?

Not entirely. It covers banking alongside accounting and commerce, but lenders commonly run it beside a bank aggregator for transaction level cash flow.

Ably vs Codat

Ably

Codat

The short version

Where they differ

What each one covers

Only in Ably

Only in Codat

What people use each for

Ably

Codat

Where each one falls short

Ably

Codat

Pricing, plan by plan

Ably

Codat

Which should you pick?

Choose Ably if

Choose Codat if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Ably

More on Codat

Keep looking

Other head to heads