Stay free if the question is still vague
Some users only need a first look. That is fine. Free should feel meaningful without acting like a trap.
Upgrade path
Upgrade when the user wants rhythm, not just curiosity.
A free preview is the right first step for curiosity. Plus becomes worthwhile when the user wants to return, compare days, plan months, and feel that the chart is becoming a useful personal system rather than a one-time novelty.
How to think about it
Move up only when the next layer solves a real need.
Upgrade when repetition starts
When the user checks timing more than once, daily and monthly layers begin to feel more valuable than a one-off preview.
Upgrade when planning matters
If the user wants more than a tone-of-the-day and starts asking about cycles, monthly context becomes easier to justify.
Teach the ladder clearly
Users trust the site more when the free-to-paid move feels like a logical deepening of value instead of a hard sell.
Best next step
Turn one result into a repeat-use system.
The strongest upgrade happens after the preview proves relevance and the user can already imagine coming back tomorrow or next month.
Keep reading
Understand the free-to-member ladder.
What a free preview can and cannot tell you
Clarify the boundary between light preview value and deeper recurring layers.
Read free preview guideDaily vs monthly guidance
Learn why recurring timing layers create more value than a one-time glance.
Read timing layer guideOpen the tools hub
See where daily, monthly, compatibility, and Liu Yao fit in the wider product structure.
Open Tools HubFAQ
Common upgrade questions.
Is Plus only for heavy users?
No. It is for users who want continuity, not only for people who want the deepest possible metaphysics stack.
Should the site push Plus immediately?
Not too early. The preview should first do its job of building trust and relevance.
What makes someone ready to upgrade?
Usually a combination of curiosity turning into routine, and the need for daily or monthly timing becoming more concrete.