Softwr

No-Code · head to head

Mendix vs Whalesync

Mendix logo

Mendix

No-Code

Siemens-owned low-code platform priced by app count, with cloud infrastructure billed separately

From
Free
Rated
-
Full reviewWebsite
Whalesync logo

Whalesync

No-Code

Two-way real-time sync between no-code databases and SaaS tools

From
$40/month
Rated
-
Full reviewWebsite

The short version

  • Only Mendix has a free tier, so it costs nothing to try first.
  • Each has a real cost: Mendix the platform fee explicitly excludes compute and infrastructure costs, so the real all-in bill is the subscription plus a separate, less predictable cloud hosting charge.; Whalesync pricing counts records held in sync rather than changes made, so a large but rarely edited catalogue costs the same as a highly active one and the economics punish exactly the datasets that need the least work.
  • They diverge on capability: Mendix covers Visual app and process modelling, Whalesync covers Two-way sync.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Mendix and Whalesync actually diverge.

Attributes where Mendix and Whalesync differ
AttributeMendixWhalesync
Starting priceFree$40/month
Pricing modelPer application tier (One App vs Unlimited Apps), cloud infrastructure billed separatelyPer month by records in sync
Free tierYesNo
PlatformsWeb, iOS, AndroidWeb

Identical on both: user rating (Not yet rated), category (No-Code).

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 Mendix

  • Visual app and process modelling
  • Free tier
  • Multi-cloud deployment
  • AI-assisted development
  • Native mobile builder
  • Marketplace connectors

Only in Whalesync

  • Two-way sync
  • Live updates
  • Field mapping
  • Unlimited mappings
  • Backfill
  • Monitoring
  • Database connectors
  • Relational field support

What people use each for

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

Mendix

  • A Siemens industrial software customer extending into application development on a platform already inside its vendor ecosystemnot Whalesync
  • A company building exactly one production app that wants the lower One App tier rather than paying for unlimited apps it does not neednot Whalesync
  • An enterprise standardising on Mendix across many departments where the Unlimited Apps tier amortises wellnot Whalesync
  • A team wanting to evaluate low-code at zero cost before committing to a paid production tiernot Whalesync

Whalesync

  • A team that plans work in Notion but reports from Airtable and needs one edit to appear in both without anyone copying it acrossnot Mendix
  • A marketing site built in Webflow whose content is authored and managed in Airtable, kept in step continuously rather than republished on a schedulenot Mendix
  • A startup keeping a Postgres application database and an internal Airtable operations view aligned without building a sync servicenot Mendix
  • An agency keeping a client CRM and a project tracker consistent so account managers and delivery staff work from the same recordsnot Mendix

Where each one falls short

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

Mendix

  • The platform fee explicitly excludes compute and infrastructure costs, so the real all-in bill is the subscription plus a separate, less predictable cloud hosting charge.
  • The jump from a free or One App tier to Unlimited Apps is a large discrete price step (roughly 918 to 2,295 euros a month at published starting rates), not a gradual scale-up, which punishes a team that grows from one app to two.
  • Being a Siemens business unit means Mendix roadmap priorities can be shaped by Siemens' broader industrial software strategy rather than purely by low-code market demand.
  • Deployment flexibility across Mendix Cloud, Azure, Kubernetes and SAP BTP is a strength on paper but means the actual infrastructure cost and complexity vary significantly by choice, complicating like-for-like vendor comparisons.
  • Premium-tier features and enterprise governance capabilities are quote-only, so a buyer cannot fully compare Mendix's top tier against OutSystems or Appian without entering a sales process.

Whalesync

  • Pricing counts records held in sync rather than changes made, so a large but rarely edited catalogue costs the same as a highly active one and the economics punish exactly the datasets that need the least work.
  • The gap between the 1,000 record starter tier and the million record higher tiers is very wide with no published intermediate price, so a business at ten thousand records cannot tell what it will pay without contacting the vendor.
  • Bidirectional sync has conflict semantics, and when two people edit the same field in two tools within a sync interval one edit is lost, which is silent and only discovered when someone notices their change reverted.
  • It is a small company holding a live connection in the middle of operational data, so continuity risk is real and any team relying on it should keep an export routine and know how it would rebuild the mapping.
  • It syncs records between tools but does not transform or model data, so anything requiring aggregation, deduplication or business logic between the two ends still needs a separate tool or a warehouse.

Pricing, plan by plan

Mendix

Free
  • FreeFree
    • Unlimited users on one deployment environment
    • No commitment or credit card required
    • Suitable for evaluation and small-scale use
  • Standard, One App$undefined/month
    • Licenses a single application in production
    • Cloud deployment and standard support options
    • Compute and infrastructure costs billed separately
  • Standard, Unlimited Apps$undefined/month
    • Licenses unlimited applications under one subscription
    • Per-user cost declines as user volume grows
    • Discounted external (B2B/B2C) user rates available
  • Premium$undefined/month
    • Custom quote
    • Enterprise-grade governance and 24/7 support
    • Advanced deployment and compliance options

Whalesync

$40/month
  • Starter$40/month
    • 1,000 records in sync
    • Live two-way sync
    • Unlimited mappings and row changes
  • Plus$undefined/month
    • Up to 1,000,000 records in sync
    • Live two-way sync
    • Unlimited mappings and row changes
  • Pro$undefined/month
    • Up to 1,000,000 records in sync
    • Priority support
    • Advanced field handling

Which should you pick?

Choose Mendix if

  • You need visual app and process modelling.
  • You want to start without paying.
  • You work on Web, iOS, Android.
  • You also want free tier.
Mendix review

Choose Whalesync if

  • You need two-way sync.
  • You also want live updates.
Whalesync review

Questions people ask

Is Mendix or Whalesync better?
Neither clearly leads. Mendix starts at Free and Whalesync at $40/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mendix or Whalesync?
Mendix has a free tier; the other does not. Paid plans start at Free for Mendix and $40/month for Whalesync.
Does Mendix or Whalesync run on more platforms?
Mendix runs on Web, iOS, Android. Whalesync runs on Web.
Can I use Mendix for free?
Yes. Mendix has a free tier, so you can try it without paying. Whalesync starts at $40/month.
What is Mendix best used for?
Mendix is most often used for a siemens industrial software customer extending into application development on a platform already inside its vendor ecosystem, a company building exactly one production app that wants the lower one app tier rather than paying for unlimited apps it does not need, an enterprise standardising on mendix across many departments where the unlimited apps tier amortises well, a team wanting to evaluate low-code at zero cost before committing to a paid production tier. Of those, a siemens industrial software customer extending into application development on a platform already inside its vendor ecosystem and a company building exactly one production app that wants the lower one app tier rather than paying for unlimited apps it does not need are not what Whalesync is typically brought in for.
What can Mendix do that Whalesync cannot?
Mendix covers Visual app and process modelling, Free tier, Multi-cloud deployment, AI-assisted development. Whalesync covers Two-way sync, Live updates, Field mapping, Unlimited mappings.

Answered from the vendors’ own pages

Mendix: What is the difference between One App and Unlimited Apps?

One App licenses a single application in production; Unlimited Apps covers any number of apps under one subscription, at a materially higher starting price.

Whalesync: How is this different from Zapier?

Zapier triggers one-way actions. Whalesync maintains a persistent mapping between two copies of a record so edits flow both ways without loops or duplicates, which two zaps cannot achieve reliably.

Mendix: Does the licence include hosting?

No. Mendix states explicitly that compute and infrastructure resources are billed separately from the platform licence, regardless of deployment target.

Whalesync: What counts as a record in sync?

A record becomes counted the first time it syncs, and records are not double counted across the two applications, so a thousand paired rows count once rather than twice.

Mendix: Who owns Mendix?

Siemens, which acquired Mendix in 2018 and runs it as part of its industrial software portfolio.

Whalesync: Is there a free plan?

No, only a seven day trial. Paid plans start around 40 US dollars a month for a thousand records.

Whalesync: What happens on a sync conflict?

One side wins and the other edit is discarded. Teams that expect simultaneous editing of the same fields in two tools should establish an owning system per field rather than relying on the sync to arbitrate.

Share

Related pages

More on Mendix

More on Whalesync

Keep looking

Other head to heads