Choose Spark if you need
- Mac, iPhone or iPad. We haven't found them on Thunderbird's website.
At a glance
- Both have a free plan.
- Spark's lowest paid plan is Plus at $10 per user per month, as of November 13, 2026.
- Both are available on Windows and Android.
- Only Spark lists Mac, iPhone and iPad.
- Only Thunderbird lists Linux and macOS.
From each tool's own website, checked on the dates below, and from published reviews.
Which to choose
From the facts checked for both tools, not from opinion. A fact we haven't confirmed for one of them is never counted.
Choose Thunderbird if you need
- Linux or macOS. We haven't found them on Spark's website.
Spark
Nobody has reviewed Spark yet. Its rating shows once it has 3 reviews.
Review Spark
Thunderbird
Nobody has reviewed Thunderbird yet. Its rating shows once it has 3 reviews.
Review ThunderbirdThe facts
- What it does
- SparkSpark takes care of your inbox and calendar so you can focus on decisions, not admin.
- ThunderbirdA free email application that's easy to set up and customize.
- Free plan
- SparkYes
- ThunderbirdYes
- Pricing
- SparkPer user, monthly or yearly
- ThunderbirdNot confirmed
- Paid plans from
- Spark
What they share
From the platforms and integrations each website lists.
Platforms
Both
- Windows
- Android
Only Spark
- Mac
- iPhone
- iPad
Only Thunderbird
- Linux
- macOS
People who switched
Reviewers who say they used one of these before the other.
No reviewer has said they moved between Spark and Thunderbird yet.
Used either of them?
Your review makes this comparison better for the next person. Review Spark or review Thunderbird.