Softwr

Telecommunications · head to head

OneSignal vs Plain

OneSignal logo

OneSignal

Telecommunications

Customer engagement and messaging, without the complexity

From
Free
Free plan
Yes
Full reviewWebsite
Plain logo

Plain

Customer Support

AI support infrastructure built for B2B teams

From
$35/month
Free plan
No
Full reviewWebsite

The short version

  • Only OneSignal has a free tier, so it costs nothing to try first.
  • Each has a real cost: OneSignal free plan email sends cap at 10,000 per month and web push is capped at 10,000 subscribers per send, per onesignal.com/pricing (Aug 2026); Plain foundation plan limited to 2,000 credits per month may be restrictive for high-volume teams
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which OneSignal and Plain actually diverge.

Attributes where OneSignal and Plain differ
AttributeOneSignalPlain
Starting priceFree$35/month
Pricing modelfreemiumTiered pricing per seat with credit system
Free tierYesNo
PlatformsWebWeb, API
CategoryTelecommunicationsCustomer Support

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

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 OneSignal

Nothing recorded that Plain does not also cover.

Only in Plain

  • Multi-channel consolidation
  • AI agents
  • Workflow automation
  • Sidekick assistant
  • Insights engine
  • Linear and Jira integration
  • Help Center and Knowledge Base
  • API-first extensibility

What people use each for

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

OneSignal

  • Sending push notifications to mobile app users when orders shipnot Plain
  • Triggering email confirmations based on form submission eventsnot Plain
  • Creating multi-step SMS and email journeys for onboarding usersnot Plain
  • Sending in-app messages to users abandoning checkout flowsnot Plain

Plain

  • Consolidating support from multiple channels into one inboxnot OneSignal
  • Automating support workflows with AI agentsnot OneSignal
  • Extracting insights and trends from customer conversationsnot OneSignal
  • Building custom support solutions with API accessnot OneSignal
  • Implementing AI-assisted customer support at scalenot OneSignal

Where each one falls short

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

OneSignal

  • Free plan email sends cap at 10,000 per month and web push is capped at 10,000 subscribers per send, per onesignal.com/pricing (Aug 2026)
  • Professional and Enterprise plans require custom annual contracts with no published rate, per onesignal.com; SMS/RCS messaging and dedicated IPs are gated behind the Professional tier

Plain

  • Foundation plan limited to 2,000 credits per month may be restrictive for high-volume teams
  • Pricing increases significantly from Foundation to Horizon ($35 to $299 per month)
  • No published pricing for Frontier (custom) plan
  • Additional seat costs ($99 per seat) add up for larger teams
  • Credit-based system requires monitoring usage to avoid overages

Pricing, plan by plan

OneSignal

Free
  • FreeFree
    • 10,000 free email sends/month
    • Unlimited mobile push
    • Basic analytics and automation
  • Growth$19/month
    • Base platform fee plus usage costs
    • Mobile push: $0.012 per monthly active user
    • Web push: $0.004 per subscriber
  • Professional$undefined/mo
    • Custom annual pricing
    • All Growth features plus SMS/RCS messaging
    • 24/7 prioritized support
  • Enterprise$undefined/mo
    • Custom annual pricing
    • Unlimited personalization
    • Dedicated success manager

Plain

$35/month
  • Foundation$35/month
    • 2,000 credits per month
    • Slack and email channels
    • Ari AI agent
  • Horizon$299/month
    • 15,000 credits per month
    • All Foundation features
    • Microsoft Teams integration
  • Frontier$null/custom
    • Custom credit allowance
    • All Horizon features
    • Discord channels

Which should you pick?

Choose OneSignal if

  • You want to start without paying.
OneSignal review

Choose Plain if

  • You need multi-channel consolidation.
  • You work on Web, API.
  • You also want ai agents.
Plain review

Questions people ask

Is OneSignal or Plain better?
Neither clearly leads. OneSignal starts at Free and Plain at $35/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OneSignal or Plain?
OneSignal has a free tier; the other does not. Paid plans start at Free for OneSignal and $35/month for Plain.
Does OneSignal or Plain run on more platforms?
OneSignal runs on Web. Plain runs on Web, API.
Can I use OneSignal for free?
Yes. OneSignal has a free tier, so you can try it without paying. Plain starts at $35/month.
What is OneSignal best used for?
OneSignal is most often used for sending push notifications to mobile app users when orders ship, triggering email confirmations based on form submission events, creating multi-step sms and email journeys for onboarding users, sending in-app messages to users abandoning checkout flows. Of those, sending push notifications to mobile app users when orders ship and triggering email confirmations based on form submission events are not what Plain is typically brought in for.
What can OneSignal do that Plain cannot?
Plain covers Multi-channel consolidation, AI agents, Workflow automation, Sidekick assistant.

Answered from the vendors’ own pages

OneSignal: How much does OneSignal cost?

OneSignal offers a free tier with 10,000 free email sends/month and unlimited mobile push. Growth plan starts at $19/month plus usage-based charges for mobile push ($0.012 per monthly active user) and web push ($0.004 per subscriber).

Source
Plain: What is included in the Foundation plan?

The Foundation plan ($35/month per seat) includes 2,000 credits per month, support for Slack and email, Ari AI agent, Linear and Jira integrations, and Help Center access. Up to 5 seats are included.

Source
OneSignal: Does OneSignal offer a free version?

Yes, OneSignal's free plan includes 10,000 free email sends per month, unlimited mobile push, basic analytics and automation, with up to 1 active journey and 2 message steps.

Source
Plain: Can I use Plain with Microsoft Teams?

Yes, Microsoft Teams integration is available on the Horizon plan ($299/month) and higher.

Source
OneSignal: What are OneSignal's email costs beyond the free tier?

After the 20,000 free email sends/month included in the Growth plan, OneSignal charges $1.50 per 1,000 additional emails.

Source
Plain: Is there a free trial for Plain?

Yes, Plain offers a 7-day free trial with no credit card required. You can also get 50% discount through their startup program.

Source
OneSignal: What is included in the Professional plan?

OneSignal's Professional plan includes custom annual pricing, all Growth features plus SMS/RCS messaging, 24/7 prioritized support, and optional dedicated IP for email.

Source
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